Solinst Model 101B [111794] Water Level Meter with P1 Probe & Metric Increments, 100m. The Solinst Model 101B Water Level Meter is designed to be an economical and basic, yet durable, instrument to measure groundwater levels. It is ideal for measuring depth to water in wells, boreholes, standpipes, and tanks. Also available from Solinst, are the Standard Model 101 Water Level Meters that feature a laser marked PVDF flat tape, and the Model 102 Coaxial Cable Water Level Meters. Both options allow shut-off and sensitivity adjustment. The Model 101B Water Level Meter uses a solid stainless steel probe, connected to durable polyethylene flat tape. A standard 9 volt battery, housed inside the reel hub, powers the Water Level Meter. The electronics are coated for water resistance. 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. The Model 101B Water Level Meter has a sturdy frame and ergonomic handle for winding the tape. A brake is also included on the reel. The faceplate is easy to remove in order to access the 9 volt battery for replacement. For convenience, there is also a probe holder on the front of the faceplate. The Model 101B P1 Probe is made from durable stainless steel. It is designed to reduce false signals in cascading water. The probe is extremely easy to replace. The Model 101B Water Level Meter uses high quality polyethylene flat tape with accurate heat embossed markings every centimeter and meter. The 10mm (3/8") wide tape reels smoothly, remains flexible, hangs straight in the well and is available in 30m, 60m, and 100m lengths. Seven stranded stainless steel conductors resist corrosion, provide strength and are non-stretch. They make the tape very easy to repair and splice. The dog-bone design reduces adherence to wet surfaces.