Airmar IDST800L 235F B122-RETR Device

Long Stem
Depth, 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 ±0.2°C (±0.1°F) accuracy