Review on 🔌 Linkstyle Dual USB Charger Socket Power Outlet with Digital Voltmeter Display - 12V 4.2A, Waterproof Dual Ports for Car RV Boat Marine Motorcycle Mobile - Blue by Runbi Alvarez

Using my Craftsman voltmeter I have confirmed that the accuracy of this device is around 10% which is pretty good. I installed the device on my Kawasaki Versys 08 as I don't have a voltmeter and this left me at a loss. The device comes with 0 installation instructions including the size of the hole or wire you need. By the way, it's 1 inch and 10 AWG. It comes with terminals, but you need a crimping tool to use them. The USB ports work well although I don't use them often as all I need is a voltmeter. Be 5 stars, it at least told you what size hole and wire you need.