1. Accuracy & resolution – The meter should reliably show the depth to water with good resolution (e.g., 1 mm increments) and minimal error (± 0.1% to ± 5% depending on use).

  2. Probe & cable/tape construction – A durable probe and non‑stretch flat tape or cable with clear graduations are preferred. For example, a flat polyethylene tape with embedded steel strands prevents sticking in wet boreholes.

  3. Detection method & usability – Many meters use an audible buzzer + LED when the probe contacts water (circuit completes). This simplifies measurement in the field.

  4. Range / depth – Choose a meter that supports an appropriate length (30 m, 50 m, 100 m, 300 m etc) depending on your well/tank depth.

  5. Durability & field readiness – Consider environmental conditions: temperature extremes, corrosion (salt water or contaminated), small diameter wells. Probes rated for pressure, sealed housings, UV‑resistant tape.

  6. Ease of use & portability – Hand‑held reel, carrying handle, readable markings, reliable in field conditions. Important for repeated measurements.

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