Airmar DST800 P17 Thru Hull Transducer 200BA For FISO RaymarineDepth speed and temperature in one compact housing 235 kHz frequency prevents mutual interference with other echosounders on the vessel Depth performance from 500 mm (1. 6') to 185 m (600') A wide port starboard fan shaped beam is able to find bottom even when installed on high deadrise hulls or on sailboats when heeled Plastic bronze or stainless steel housings available Fast response temperature sensor provides 0. 2C (0. 1F) accuracy