International Instruments Industries

• �� Key Specifications

  • Display: 3 5/6 digits, 6000 counts

  • Measurement Categories: Not specified in available sources

  • Voltage Measurement:

    • DC Voltage: Up to 1000V

    • AC Voltage: Up to 750V

  • Current Measurement:

    • DC Current: Up to 20A

    • AC Current: Up to 20A

  • Resistance: Up to 60MΩ

  • Capacitance: Up to 9.999mF

  • Frequency: Up to 10.00MHz

  • Duty Cycle: 0.1% to 99.9%

  • Temperature Measurement: Supported (with K-type thermocouple)

  • Additional Features:

    • True RMS (TRMS) measurement

    • Auto and manual ranging

    • Data hold function

    • Relative measurement (REL)

    • Maximum/Minimum recording

    • Backlit LCD display

    • Auto power off

    • Low battery indication

    • Includes holster

  • Power Supply: 2 x 1.5V AA batteries

  ⚠️ Safety Category (CAT Rating)

  The available product listings do not specify the safety category (CAT II, CAT III, or CAT IV) for the Meco 171B+ TRMS. Without this information, it's challenging to determine the multimeter's suitability for various electrical environments.

  �� Package Includes

  • Meco 171B+ TRMS Digital Multimeter

  • Test leads

  • Holster

  • 1.5V AA batteries

  • Instruction manual

  • K-type thermocouple (for temperature measurements)

Additional Information:

• Item Code: 171BTRMS
• Delivery Time: READY STOCK

• Test Leads x 1 Pair
• 1.5V 'AAA' Battery x 2 Pcs
• Instruction Manual x 1 Pc
• Carrying Case x 1 Pc
• Cable Dia. 25mm (max.) x 1 Pc

Additional Information:

• Item Code: 18SMART
• Delivery Time: READY STOCK

• Model: MECO 36-AUTO BL

• Display: 3⅚ digit, 6000 counts TRMS digital LCD

• Clamp Range: up to 600 A AC and DC current 

• Jaw Opening: approx. 25–30 mm cable diameter maximum

• Safety Rating: CAT II 600 V 

• Power: 2 × AAA batteries (installed) 

Current

• AC Current: up to 600 A TRMS

• DC Current: up to 600 A
  (Autoranging) 

Voltage

• AC Voltage: up to 600 V

• DC Voltage: up to 600 V
  (Autoranging) 

Resistance

• Up to 60 MΩ (auto ranging) 

Capacitance

• Up to 60 mF (auto ranging) 

• Temperature measurement (with included K-type thermocouple, typically up to ~260 °C) 

• NCV (Non-Contact Voltage) detection with LED & buzzer 

• Duty cycle measurement (0.1 %–99.9 %) 

• Diode Test 

• Audible Continuity Test 

• Data Hold & Auto Power Off 

• Backlight and Torch Light for clamp/header illumination 

• Pair of test leads

• K-Type Thermocouple probe

• Carrying case

• Batteries installed

• Instruction manual 

• Dimensions: approx. 185 × 65 × 28 mm

• Weight: ~170–180 g (with battery) 

✔ AC/DC current and voltage measurement
✔ True RMS readings for more accurate AC measurements
✔ Temperature, frequency, capacitance, resistance checks
✔ Electricians, maintenance, HVAC, and general worksite diagnostics

Additional Information:

• Item Code: 36-AUTO
• Delivery Time: READY STOCK
• Packaging Details: 1NOS PACKING

• Testing and verifying earthing/grounding systems in electrical installations — e.g. building earthing rods, substations, lightning‑protection grounding, grounding for machinery, etc.

• Checking earth resistance to ensure a good low‑impedance ground connection (important for safety, fault‑protection, lightning, surge protection).

• Measuring earth / ground voltage to detect stray or dangerous voltages on grounding lines — helpful for safety audits.

• Field‑use maintenance or inspection work — due to portability, rechargeable battery power, compact size and relatively simple operation.

• Accuracy is reasonable (±2% + 5 digits), but for very high‑precision needs or extremely low earth‑resistance systems, results should be interpreted carefully.

• For deep‑earth or large‑installation grounding systems, proper electrode spacing and correct external rod connections are necessary for accurate readings (as with any earth‑tester).

• The maximum resistance range (up to 1000 Ω) means it’s more suitable for earthing/ground checks rather than very high‑resistance insulation tests — i.e. this is a ground‑resistance tester, not an insulation‑megger.

Additional Information:

• Item Code: DET-99
• Delivery Time: READY STOCK
• Packaging Details: 1NOS PACKING

• True RMS (TRMS) measurement — accurate AC readings even on non-sinusoidal or distorted waveforms. 

• Autoranging + Manual Ranging — automatically selects the best range or lets you choose manually. 

• 6600-count / 3 5/6-digit display for clearer and more detailed readings than basic 3½-digit meters. 

Voltage

• DC Voltage: up to 1000 V 

• AC Voltage: up to 750 V 

Current

• DC Current: up to 20 A 

• AC Current: up to 20 A 

Resistance & More

• Resistance: up to 60 MΩ 

• Capacitance: up to 9.999 mF 

• Frequency: up to 10.00 MHz 

• Duty Cycle: 0.1 % – 99.9 % 

• Temperature: via included K-type thermocouple (up to ~260 °C) 

• Diode test and audible continuity buzzer 

• Data Hold to freeze readings on display 

• Auto Power Off to save battery 

• Low battery indication 

• Test leads (pair) 

• Batteries (usually 2 × 1.5 V AA) 

• Instruction manual 

• K-type thermocouple for temperature measurement 

• Carrying case

This meter is suitable for:
✅ General electrical diagnostics and maintenance
✅ Electronics workshops and lab measurements
✅ HVAC and appliance servicing (frequency & temperature)
✅ Automotive electrical work
✅ Training and education environments

• Autoranging makes it easy for quick tests without range selection. 

• TRMS improves accuracy on complex AC signals over cheap averaging meters. 

• Wide measurement ranges cover most hobbyist and professional needs. 

Additional Information:

• Item Code: 666TRMS
• Delivery Time: READY STOCK
• Packaging Details: 1NOS PACKING

Key Features:

• AC/DC Current Measurement: The ZT-QS9 can measure both AC and DC currents, typically covering a wide range of 0 to 1000 A or similar.

• True RMS Measurement: With True RMS (Root Mean Square) functionality, it ensures accurate measurements even in circuits with non-sinusoidal waveforms, which is critical for modern electrical equipment like VFDs or devices with distorted signals.

• Voltage Measurement: Likely supports both AC and DC voltage measurements up to 600V or 1000V, making it versatile for many types of electrical systems.

• Resistance & Continuity Testing: Includes resistance measurement and continuity testing, which is useful for checking circuits, fuses, and wiring integrity.

• Frequency Measurement: Some models offer frequency measurement, which is useful for diagnosing issues in electrical systems like motors or circuits powered by variable frequency drives (VFDs).

• Data Hold & Max/Min Function: Features like data hold for freezing the reading and max/min functions for tracking peak values over time are typically included.

• Backlit Display: The digital LCD display is typically backlit for better visibility in low-light conditions.

• Jaw Size: The clamp jaw is likely large enough (typically 30mm or more) to clamp around most conductors easily.

• Overload Protection: Designed with built-in overload protection to prevent damage when measuring high currents or voltages.

• Safety Rating: Complies with common safety standards like CAT III 600V or CAT IV 300V, ensuring it's safe for use in industrial and commercial electrical systems.

• Battery-Powered: Usually powered by AA or 9V batteries, with an auto power-off feature to preserve battery life.

• Multi-Functional: Measures not only AC/DC current, but also voltage, resistance, and frequency, making it a versatile tool for many electrical tasks.

• True RMS Accuracy: Provides accurate measurements in all types of electrical systems, including those with distorted waveforms.

• Compact and Portable: Easy to handle with a lightweight design, making it ideal for field use.

• User-Friendly: Simple interface with functions like data hold, backlit display, and overload protection for ease of use and safety.

• Affordable: Typically, Zoyi clamp meters are known for being relatively affordable compared to other brands, providing good value for money.

• Electrical Troubleshooting: Great for electricians and technicians working in industrial, commercial, or residential environments.

• HVAC Systems: Used for measuring current and voltage in heating, ventilation, and air conditioning systems.

• Motor Testing: Helps to measure inrush current, operational current, and diagnose electrical issues in motors.

• Home Appliances: Measures electrical parameters in household appliances, tools, or small electronics.

• General Electrical Work: Suitable for general-purpose use where current, voltage, and resistance need to be measured.

The ZOYI ZT-QB1 is a smart digital clamp meter designed for ease of use, particularly suitable for beginners, students, electricians, and technicians. It features a very simple and intuitive panel with integrated flashlight and backlight functions, making it ideal for various electrical measurement needs in both professional and educational environments.

• Display Count: 4000 counts digital LCD.

• Measurement Capabilities:

  • AC/DC Voltage: 4.000V, 40.00V, 400.0V, 600.0V (Accuracy: DC ±0.5%+3, AC ±1.0%+3).

  • AC Current: 4.000A, 40.00A, 400.0A, 600.0A (Accuracy: ±2.0%+30).

  • Resistance: 4.000kΩ/40.00kΩ/400.0kΩ/4.000MΩ/40.00MΩ (up to 60MΩ).

  • Frequency: 4.000Hz, 40.00Hz, 400.0Hz, 4kHz, 40kHz, 100kHz.

  • Continuity, NCV (Non-contact Voltage detection), Inrush Current, Voltage Peak Hold, Diode testing.

• Smart Mode: Automatically determines and switches measurement type.

• True RMS: Accurate readings even with non-sinusoidal waves.

• Peak Hold: Captures and displays surge or peak values.

• Data Hold: Freezes the reading on the display for recording.

• Backlight/Flashlight: Illuminates the display and target area in dim conditions.

• Jaw Opening: 43 mm for easy current measurement around large cables.

• Low Battery Alert, Auto Power Off: For long battery life and user convenience.

• CAT III 600V Safety Rating: Ensures robust protection in high-voltage environments.

• Dimensions: 172 × 64 × 32 mm.

• Weight: Approximately 161 g.

• Material: Plastic body.

• Accessories: Comes with test leads, user manual, wrist strap, and color box packaging.zotektools

This device is suitable for:

• Electrical installation and maintenance

• Home troubleshooting

• Educational demonstration

• HVAC, industrial equipment servicing

The ZOYI ZT-QB1 clamp meter simplifies complex electrical measurements with its user-friendly interface and automatic smart mode selection. Its compact design, 43 mm jaw opening, and integrated flashlight/backlight provide practical advantages for on-site measurements and troubleshooting in poorly lit spaces. The true RMS functionality ensures reliable operation in modern electronic and power environments where loads are often non-linear. Its extensive range of functions, robust safety rating, and additional features such as inrush current and peak hold make it a versatile tool for both professionals and novices in the field.

Additional Information:

• Production Capacity: 100 NOS. IN STOCK

Because of its wide range of measurement functions, HTC 21S is useful for:

• Electrical maintenance / wiring work — measuring AC/DC current & voltage, checking circuits, motors, wiring loads, load current on mains or equipment.

• Troubleshooting & diagnostics — checking continuity, resistances, diodes; testing capacitors; verifying connections in electronics or electrical devices.

• Industrial / workshop / HVAC / motor maintenance — measuring current draw, motor startup current (inrush), AC/DC loads, capacitors.

• Home & field service / electricians / technicians — safe, clamp-based current measurement on live wires, without disconnecting circuits.

• Multi-purpose electronics / equipment testing — because it supports many measurement modes (voltage, current, resistance, capacitance, frequency, temperature, continuity), it’s handy for varied tasks from small electronics to heavier mains setups.

• The meter’s maximum input voltage when using probes (for voltage, resistance, etc.) is 600 V — exceeding this risks damage or hazard. For AC current measurement: meter works with True RMS, but for inrush current (e.g. when a motor starts), the accuracy may differ (some error margin) — keep this in mind when interpreting startup current readings. 

• For accurate readings, respect the meter’s ranges (e.g. don’t attempt to measure very high voltage/current beyond specified limits).

When you purchase HTC 21S, you generally get: the clamp-meter unit, test leads, a thermocouple probe (for temperature), user manual, batteries (AAA ×3), and a carry case. 

Additional Information:

• Item Code: 21S
• Delivery Time: READY STOCK
• Packaging Details: 1NOS PACKING

1. Measurement Parameters:

   • Vibration Velocity (mm/s or in/s)

   • Vibration Displacement (µm)

   • Vibration Acceleration (m/s² or g)

   These measurements are essential for assessing the mechanical condition of rotating machinery.

2. Frequency Range:

   • Typically, 10 Hz to 1,000 Hz, which covers the common frequency range for most industrial equipment.

3. Accuracy:

   • ±5% accuracy for vibration velocity measurements.

   • Slight tolerance for other measurements (displacement and acceleration).

4. Display:

   • Digital LCD screen that provides clear, real-time readings.

   • Backlit display for use in low-light environments.

5. Measurement Range:

   • Velocity: 0.1 mm/s to 199.9 mm/s

   • Acceleration: 0.1 m/s² to 199.9 m/s²

   • Displacement: 0.1 µm to 199.9 µm

6. Sensor:

   • Uses a piezoelectric accelerometer or similar sensor to detect vibrations, which is either attached directly to the equipment or used with a magnetic base.

7. Power Supply:

   • 9V battery (often rechargeable).

   • Auto-off function to conserve battery life when not in use.

8. Portability:

   • Lightweight and compact, designed for easy handheld operation.

   • Ideal for field use and on-the-spot measurements without interrupting machinery operation.

9. Data Hold Function:

   • The data hold feature allows the current reading to be frozen on the display for easy inspection and documentation.

10. Alarm Function (Optional):

    • Some models include an alarm that triggers when vibration levels exceed a pre-set threshold, helping alert users to potential issues.

11. User-Friendly:

    • Simple, intuitive controls for easy operation.

    • Clear, easy-to-read digital display.

• Industrial Maintenance: Regularly used to monitor the condition of rotating machinery such as motors, pumps, and compressors in manufacturing plants, power plants, and oil & gas facilities.

• Predictive Maintenance: Helps technicians detect early signs of malfunction (e.g., imbalance, misalignment, bearing issues) before they lead to equipment failure.

• Troubleshooting: Useful for pinpointing vibration-related issues and diagnosing their cause, whether it's mechanical wear, misalignment, or imbalance.

• Field Inspections: The portable design allows for quick, on-site vibration checks without requiring expensive or bulky equipment.

• ISO and Industry Standards Compliance: Often used to ensure machinery is operating within safe vibration limits in accordance with industry standards (e.g., ISO 10816).

• Portability: Easy to carry and use in various locations for quick, real-time vibration measurements.

• Multiple Parameters: Measures vibration velocity, acceleration, and displacement, offering a complete analysis of machine condition.

• Cost-Effective: Provides essential vibration monitoring features at an affordable price for routine machine checks and maintenance.

Additional Information:

• Item Code: PVB-820
• Delivery Time: READY STOCK
• Packaging Details: 1NOS PACKING

• The Pro EV-C1 is a clamp meter designed especially for EV (electric vehicle) applications and general high-current AC/DC work. 

• It supports True-RMS measurement for AC and DC current. 

• It is described as “pocket-sized, compact” yet with a very wide current measurement range (DC and AC) from 4.000 A up to 1000 A. 

Here are selected specs drawn from the product pages:

• Measurement range (current): 4.000 A / 40.00 A / 400.0 A / 1000 A (for both AC and DC) 

• Accuracy: ±1.5% ±3 digits for most ranges. For AC current: ±1.5% ±3 digits (50/60 Hz), ±2.0% ±4 digits (40-400 Hz) 

• Jaw opening diameter: ~25 mm. 

• Inrush current measurement supported (ranges: 1000 A / 400 A / 40 A / 4 A) with ~100 ms integration time. 

• Other features:

  • One-touch zero adjustment (for DC current) 

  • Non-contact voltage detection (NCV) and non-contact frequency measurement 

  • Low-pass filter (LPF) with 1 kHz cut-off for AC measurement in noisy environments. 

• Display: Backlit LCD, 3-3/4 digits (typical) with bar-graph for transient/inrush observation. 

• Power supply: 2 × AAA batteries (according to one listing) 

• Operating ambient conditions: e.g., -10 °C to +50 °C, humidity < 85% RH, altitude up to ~2000 m. 

Given its specification, the Pro EV-C1 is well suited for:

• Monitoring DC/AC current in electric vehicle (EV) systems (batteries, inverters, charging systems) — due to the high current range and DC capability.

• Measuring general industrial AC/DC current up to 1000 A (e.g., motors, large conductors, heavy equipment)

• Capturing inrush currents when motors or large equipment start up — useful in commissioning/troubleshooting.

• Use in congested wiring/cable areas because of relatively small jaw size (~25 mm) compared to very large clamps.

• Work in mixed environments where both AC and DC currents might be present.

• The jaw opening is ~25 mm — for very large conductors or bus-bars thicker than that, you might need a larger jaw or flexible clamp accessory.

• Although the accuracy is good (±1.5%±3dgts), for extremely high precision calibration applications you might need instruments with higher accuracy or calibration certification.

• The non-contact features (NCV, frequency) are helpful but do not replace proper measurement leads/test methods when precision is critical.

• Ensure the safety rating (CAT / voltage environment) is adequate for your application (the listing does not fully specify the CAT rating in the summary). Always check your environment (voltages, categories) and whether the instrument conforms.

Additional Information:

• Item Code: EV-C1
• Delivery Time: READY STOCK
• Packaging Details: 1NOS PACKING

• Non-contact ground resistance measurement

• Leakage current measurement (AC)

• No auxiliary rods or electrodes needed — simplifies testing and saves time. 

• Auto-ranging — automatically selects measurement range. 

• Data Hold & Memory Storage (99 sets) — lets you freeze values and store results for later review. 

• Continuity loop test — checks continuity of ground paths. 

• Auto Power Off — saves battery life. 

• 0.010 Ω – 1000 Ω (auto)

• Resolution & accuracy vary by range (e.g., 0.001 Ω @ ±(1%+0.01Ω) for lowest range) — see detailed specs in table. 

• 0 mA – 30 A AC

• Resolution & accuracy:

  • 0–80 mA: 0.05 mA resolution, ±(2.5%+1 mA)

  • 80 mA–650 mA: 0.5 mA resolution, ±(2.5%+2 mA)

  • 650 mA–4 A: 5 mA resolution, ±(2.5%+10 mA)

  • 4–30 A: 10 mA resolution, ±(2.5%+20 mA) 

• Jaw Opening: ~65 × 32 mm — suitable for flat earthing strips or conductors up to this size. 

• Display: 4-digit 9999 counts LCD (often with backlight). 

• Memory: Stores up to 99 measurement sets. 

• Configurable Alarms:

  • Resistance: 1–199 Ω

  • Current: 1–499 mA 

• Battery: 4 × 1.5 V AA alkaline (included). 

• Operating Environment: approx. –10 °C to +55 °C. 

• Overload Indication: Displays “OL” when out of range.

• Dimensions: approx. 293 × 90 × 66 mm. 

• Weight: approx. 1250 g (incl. batteries). 

• Resistance verification plate (for quick calibration check)

• Carrying bag

• Instruction manual

• Batteries installed 

• Earthing systems on transmission/distribution towers

• Lightning arrestor checks

• Telecommunication shelters

• Hazardous storage tank bonding and grounding verification

• Leakage current assessment in live circuits 

Additional Information:

• Item Code: 4680BLC
• Delivery Time: READY STOCK
• Packaging Details: 1NOS PACKING

Fluke 301E Series AC/DC Clamp Meter is designed for measuring both AC and DC currents up to 400A without direct contact with live conductors. It features a large digital display for clear, accurate readings of voltage, current, resistance, and continuity. The meter’s compact and ergonomic design ensures it is easy to use in tight spaces and for extended periods. Built with durability in mind, it is ideal for industrial and electrical environments. The Fluke 301E offers reliable, high-quality performance for electricians and maintenance professionals.

Fluke 325 True RMS Clamp Meter is designed for accurate AC and DC current measurements up to 400A, along with voltage, resistance, and continuity testing. It features True RMS technology for precise measurements on non-linear loads, ensuring reliable readings. The meter has a large, easy-to-read digital display for clear results in various conditions. With its compact, durable design, it’s ideal for use in tight spaces and demanding environments. The Fluke 325 is perfect for electricians and technicians performing routine maintenance and troubleshooting.

• Wide current range: Can measure up to 300 A AC, which is decent for many applications.

• Multi-function: Not just current — also measures voltage (AC/DC), resistance, and temperature.

• Pointer lock: Useful when taking measurements and you want the needle to stay in place (for later reading).

• Compact clamp size: 34 mm jaw makes it handy for moderate-sized conductors.

• Temperature probe: Comes with a temperature probe for measuring temperature.

• Analog reliability: For some uses, analog meters give smoother “trend” readings, especially for fluctuating currents.

• Being analogue, it's less precise than a digital meter for some tasks.

• The accuracy is only ±3% (for many ranges) — fine for rough work, but not super high precision.

• Temperature accuracy is ±5%, which may not be very tight for very exact thermal measurements.

• The clamp opening (jaw) is limited to 40 mm, so very large conductors may not fit.

• Requires a battery (AA), so you’ll need to keep a spare.

• No modern digital features such as data logging, min/max, or auto-ranging.

• Industrial / electrical maintenance: Measuring AC current in wiring, panels, or devices.

• Field service: Since it's analog and robust, good for quick checks where digital may be overkill.

• Temperature + current checks: Useful when you need to measure both current and temperature (e.g., in motors or heating elements).

• Educational / training use: Great for teaching current measurement and analog meter behavior.

Additional Information:

• Item Code: M-300
• Delivery Time: READY STOCK
• Packaging Details: 1NOS PACKING

• Checking whether a circuit or wire is live (AC/DC) — useful before doing wiring work, repairs, or maintenance.

• Quick continuity checks (e.g. verifying a fuse, bulb or wiring continuity).

• Non-contact detection of live wires — helpful for safety, especially when you don’t want to make direct contact.

• General electrical troubleshooting — for domestic wiring, sockets, switches, small installations.

• This is a basic tester/detector, not a full multimeter: it doesn’t measure exact voltage values (for that, you'd need a meter). KM 66 gives LED/indicator-based detection. 

• For very low voltages or non-standard wiring, non-contact detection may be less reliable; contact detection/probes give more precise indication. 

• It is intended for “low-voltage installations” (the usual AC/DC mains and wiring), not for high-voltage overhead lines or HV installations. 

Additional Information:

• Item Code: KM66
• Delivery Time: READY STOCK
• Packaging Details: 1NOS PACKING

Fluke 301A Clamp Meter is a versatile tool designed for measuring AC current up to 400A without direct contact with conductors. It features a large, easy-to-read display for clear, accurate readings in various electrical applications. With its compact design, the meter is lightweight and portable, ideal for quick field use. The 301A also provides measurements for voltage, resistance, and continuity, offering comprehensive functionality. Its robust construction ensures durability and reliability in tough work environments.

Fluke 302+ CAT III Digital Clamp Meter is a compact and reliable tool for measuring AC current up to 400A without direct contact with live wires. It features a clear digital display for accurate readings and includes additional functions for measuring voltage, resistance, and continuity. With a CAT III 600V safety rating, it ensures safe operation in industrial environments. Its ergonomic design makes it easy to use in tight spaces, offering enhanced versatility for electrical professionals. The Fluke 302+ is ideal for everyday maintenance and troubleshooting tasks.

Fluke 301B Clamp Meter is a compact and durable tool designed for measuring AC current up to 400A without direct contact with electrical conductors. It features a clear digital display for easy and accurate readings, even in low-light environments. The meter also includes functions for measuring voltage, resistance, and continuity. With its ergonomic design, the Fluke 301B is lightweight and portable, making it ideal for field use. Built to withstand tough industrial conditions, it ensures reliable performance for electricians and technicians.

Fluke 376 FC True RMS Clamp Meter with iFlex is a versatile tool designed for accurate AC and DC current measurements up to 1000A, along with voltage, resistance, and continuity testing. It features True RMS for precise measurements in non-linear applications and includes the iFlex flexible current probe for measuring in tight or awkward spaces. With Fluke Connect, it allows wireless data sharing and real-time monitoring on mobile devices. The meter is built for durability, offering a rugged, ergonomic design for industrial and commercial use. Ideal for electricians and maintenance professionals, it enhances productivity and safety during electrical troubleshooting.