American Autowire voltage testers make troubleshooting easier. Designed to be simple probe-n-test devices, these battery and alternator voltage testers have a tip that is very sharp to allow for easy insulation piercing. Featuring a serrated clip, they include their own insulated boot to make it easy to isolate. Testing circuits and tracing power can be tricky. Make American Autowire voltage testers one of the must-have tools in your toolbox.