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【Measurement Accuracy】: The measurement unit is centimeters, and the applicable temperature of the instrument is -20℃--+60℃. This water level meter delivers reliable and accurate readings with 1mm resolution and less than 2mm repeatability error, ensuring consistent monitoring across wells, boreholes, and reservoirs. 【Suitable for Various Water Measurement Needs】Effortlessly measure depths from 10 m to 300 m, with options for 10m, 20m, 30m, 50m, 100m,150m, 200m, 250m, 300m. 10-50 m use larger probe with 0.99in (25mm), 100-300 m use smaller probe with 0.6in (15mm). Please confirm the correct size for your needs before purchasing. 【Structure and Composition】Steel ruler water levels gauge is composed of probe, steel ruler cable, receiving system and winding reel. It features 304 stainless steel probe with built-in waterproof contacts to ensure durability and waterproof performancefor long-time use. When in use, please handle the probe with care. 【Operating Principles】The Water Level Meter uses a solid stainless steel probe, connected to tape measure. The water levels gauge is powered by a 9V battery, saves the trouble of connecting another power cord. When the probe enters water the electrical circuit is completed, sending a signal back to the reel where a light and clearly audible buzzer are activated. The water level is then determined by taking a reading directly from the tape at the top of the well casing or borehole. 【Versatile Applications】 This well water level meter sensor works for wells, boreholes, tanks, pipes, and garden ponds—suitable for groundwater gauge, pipe inspection, irrigation, drilling. A must-have reliable water level probe measurement tool for residential or large-scale projects