Compact and lightweight Slope Water Level Indicators feature a sturdy aluminum cable reel with 1⁄8" round polyurethane cable permanently marked in 100ths of a foot. As the sensor is lowered down the well, a light and buzzer indicate contact with the water table. An eyelet is located on the sensor tip for easy attachment of a weight. Built into the cable reel are a light, buzzer and battery test switch. Unit is available in a variety of cable lengths.