Find fish faster with the XNT-9-20-T 710198-1 Depth/Temp 200/83 Transom Mount. It can be used in conjunction with your fish-finder to help you detect fish. Made by Humminbird, this waterproof transducer comes with a mount for easy attachment to your pole. It works by detecting life in the water and then alerting you. This transducer weighs 1.1 pounds and measures 8.5 inches by 7.3 inches. It also has a GPS feature that allows for more precise locations.