The Plastimo Echotest II Handheld Depth Sounder is a small, simple to operate handheld depth sounder, especially useful to dinghy sailors and scubadivers. It gives depth indication relative to the bottom, distance to a rock or to an underwater quay. Totally waterproof, the Echotest II sounds up to 80 metres, and can be used at a maximum depth of 50 metres. Echotest operates only when immersed.SpecificationsDisplay: LCD (7 segments)Frequency: 200KHzBeam Angle: 24 degrees (at -6 dB)Depth Range: 0.6m – 79mFunction: Auto Power-Off, 50m waterproofDimensions: 42mm x 198mmPower Supply: DC9V (Dry Cell S-006P)Battery Life: approx. 500 timesWeight: approx 200g (with Dry Cell)