Fisher M-101 Metal Detector The Fisher M-101 metal detector was designed specifically for finding reinforcing bars and other metal objects embedded in concrete, conduits, PK nails, wiring, wall studs and other metallic objects. Users may expect accuracy to ¼” of the centerline of the rebar. SPECIFICATIONS: # Operating Frequency: 4.5kHz # Power Supply: +/– 9V, 2 – 9V NEDA 1604 # Weight: 2.8lbs (1.3kg) # Dimensions: Control Box: 3 x 5 x 6” (8 x 12 x 16cm) # Shipping Dimensions 26 ½ x 6 ¼ x 6 ¼” (67 x 16 x 16cm) INTRODUCTION: The M-101 is a metal detector with a small search coil that provides a concentrated search signal. The M-101 will respond to all types of metal (rebar, wire mesh, metal conduit, metallic trash, metal- lic targets on the opposite side of surface to be scanned, etc.) which may be associated with the area that is to be searched. The M-101 will not respond to non-metallic targets such as plastic or fiberglass. The M-101 is not designed to be a wire or pipe tracer. Fisher Research manufactures other specific equipment for that purpose. Description: The M-101 comes ready to use for searching in floors, walls, columns, and ceilings. The control housing is designed to be chest or belt mounted for ease of use and comfort. A carrying bag is included in the package. Sensitivity: This control turns the M-101 On & Off. It also permits a wide range of sensitivity to metal targets. MAXimum position is normally used in the initial scanning and locat- ing operation. MINimum or reduced sensitivity is used to help pinpoint metal objects. Penetration: Controls the depth of penetration. This knob is free spin- ning and does not have stops in either direction. Meter Gives a visual display of signal strength and Battery Test Battery Test Used to test the condition of the batteries in the M-101. Battery Access The M-101 is powered by two 9 volt batteries. Access to the batteries is on the back of the detector. OPERATION: Test Batteries: Turn the M-101 On (Sensitivity control knob). Depress the Battery Test button. A response of 80 or more on the meter indicates batteries are in an operable condition. NOTE: Occasionally check the batteries during use, as weak batteries could lead to reduced signal depth. SCANNING: 1. Turn the M-101 On (Sensitivity control knob) to the RED arrow. If there is a sound and meter reading, reduce (turn counter-clockwise) the Penetration control, or move search coil away from any nearby metal. 2. Place search coil on the surface that is to be scanned. Con-tinue to keep it away from any metal objects. Adjust the Penetration control until the meter reads 10. (To increase the meter reading, turn the Penetration control clockwise; to decrease the meter reading, turn the control-counter clockwise.) 3. Scan the area to be searched. When a maximum signal is located, slowly reduce the Penetration control (turn counter-clockwise) to narrow the response area. This narrow response should be the center line of the target. It should be directly underneath the red line on the search coil. (Note: As you reduce the Penetration, be careful not to completely cancel out the target.) 4. If you find that it is difficult to get a narrow response, it may be to your advantage to increase the distance from the search coil to the target.