The dual-frequency B258 includes an array of four ceramic elements delivering both 50 kHz with a 15° port/starboard beam width (21° fore/aft), and 200 kHz with a 3° port/starboard beam width (5° fore/aft). 50 kHz low-frequency operation offers a maximum operational depth of 900 m (3000 ft), while 200 kHz high-frequency provides higher-resolution fish arches and bottom detail in shallower water.
One sensor does it all. Able to measure both depth and temperature in a single package, the B258 simplifies installation and requires just one connection to your echosounder module or multifunction display.
With bronze housing, the B258 is suitable for thru-hull mounting in fiberglass and wood hulls. Thru-hull mounting places the transducer in the water on the outside of your boat’s hull; a hole must be drilled for installation, and a fairing block is required to ensure proper alignment. This typically offers the best depth measurement and fishfinding performance.
Calculate the beamwidth for this transducer