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.