The BikeTek Battery & Alternator Tester is a quick and easy to use waterproof tester.Quick and Easy To UseTraffic Light Display ReadingsIP65 Water-proofThe BikeTek Battery & Alternator Tester monitors the charge state of 12V batteries and alternator system - showing the results via a simple traffic light display. The tester connects to the battery by terminal leads, allowing the unit to give a Poor, Fair or Good reading of the battery state, and indication of the operating status of the alternator when the engine is running. The unit is IP65 water-proof, allowing it to be connected to the motorcycle for prolonged periods if required.