Lightforce CBUSB3 Dual Voltmeter with 3.0 Amp USB Fast Charger

Designed to monitor both your main battery and your auxiliary battery, this Voltmeter from Lightforce takes the stress out of wondering whether your batteries will go the distance. You can keep an eye on voltage levels and monitor your alternator charge rate while on the road and catch any dual battery isolator faults before they cause an issue.