Fisher M97

Valve & Box Locator
The Fisher M-97 is engineered for professionals in damage prevention, municipal utilities, and infrastructure maintenance who need to locate buried or paved-over metallic objects such as valves, boxes, and manhole covers. Built on the legacy of the M-95 and M-96, the M-97 offers improved handling and storage, while delivering reliable performance in challenging environments.
With its powerful all-metal mode, the M-97 detects targets made of iron, aluminum, brass, and lead—even through asphalt and concrete. The Ground Effect Rejection VLF circuitry filters out false signals from mineralized soil, wet surfaces, or pavement. Operators can select between “Normal” and “High” modes for quick searches or increased depth, while the Ultra Slow Auto-Tune feature minimizes drift. Audio tones and needle movement provide intuitive target feedback, and the waterproof Double-D coil ensures effective use in varied field conditions.
The M-97’s rugged yet lightweight design includes an adjustable shaft with a double-locking stem and simple two-knob interface with a pushbutton retune. It operates on two 9V batteries with up to 25 hours of life and features a built-in battery tester. Designed for portability, the searchcoil folds flat for compact storage in its optional hard case—making it a practical, dependable tool for demanding utility work.

Specifications
- Manufacturer: First Texas Products, LLC
- Brand Name: Fisher Research Labs
- Country of Origin: USA
- Warranty: 2 Years
- Output Frequencies of Search Coil: 4.5 kHz
- Sensitivity: 0.20 mV RMS for full scale
- Sensitivity Adjustment Range: 12:1
- Output Indication – Meter: 1 mA, 0–100 linear scale
- Output Indication – Speaker: 16-ohm impedance
- Output Indication – Headset (optional): 8-ohm impedance
- Audio Frequency: 450 Hz
- Power Supply: (2) 9V batteries
- Battery Life (Alkaline): 25–35 hours
- Power Consumption – Base: (-9V) 13.8 mA
- Power Consumption – Minimum Sound: 8 mA
- Power Consumption – Maximum Sound: 50 mA
- Power Consumption – Audio Threshold: 17.5–18.5 mA
- Search Coil Configuration: Double-D
- Weight with 8″ Search Coil: 3.3 lbs (1.5 kg)
- Weight with 11″ Search Coil: 3.9 lbs (1.8 kg)
- Dimensions: 38 to 50 inches adjustable (96 to 127 cm)
Documentation
If you have any questions, feel free to contact Instrument Technology Corporation at 800-519-1998.