Garmin GT30-THPGarmin GT30 THP Perfect for the shallow water fisherman who want CHIRP ClearV and CHIRP SideV scanning sonar with stainless steel stems, this pair of 12 pin thru hull transducers consistently displays clear definition of objects, structure and fish below and to each side of the boat. These transducers with built in fast response temperature sensors have a power rating of 500 W per element (1,500 W total); a depth of 750 ft (ClearV) and 500 ft left and