This super handy voltmeter plugs into any SAE charger adapter, indicating voltage on the fly. I keep one in my jacket pocket and check the voltage of any bike before I head out on a ride. Most chargers use SAE adapters, including the ones I sell here so it’s very convenient to have a voltmeter that plugs into the same adapter. If you’re truly paranoid you can run an SAE lead up to the dash and permanently mount this voltmeter. It has a built-in shut off after 30 seconds once the button is toggled to activate the voltmeter. LED readout indicates voltage while three indicator light tell the state of charge. You can also pick up SAE leads here for a song.