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Dual Frequency The dual-frequency PDT-WBL includes a single ceramic element delivering both 83 kHz with a 52 beam width and 200 kHz with a 22 beam width. 83 kHz low-frequency operation offers a maximum operational depth of 300 m 1000 ft while 200 kHz high-frequency provides higher-resolution fish arches and bottom detail in shallower water. Depth/Temperature One sensor does it all. Able to measure both depth and temperature in a single package the PDT-WBL simplifies installation and requires just one connection to your echosounder module or multifunction display. Mounting The PDT-WBL is suitable for in-hull mounting in fiberglass hulls or trolling-motor mounting with any hull type. In-hull or shoot-thru-hull transducers dont require a hole to be drilled in your boats hull for installation and offer good high-speed performance and ease of maintenance but reduced maximum depth and fishfinding performance versus thru-hull transom or other in-water installations.