The Sea Sense Deluxe EZ Troubleshooter II Circuit Tester with Cap is a high-quality tool designed for troubleshooting electrical circuits on boats. With its 4-way tester capability and model number 50080310, this circuit tester from Sea Sense is perfect for outdoor sports enthusiasts looking to ensure the proper functioning of their boat's electrical systems. The included cap adds an extra layer of convenience and ease of use, making it a must-have for any boater needing to test and fix electrical circuits.