Review on 🔌 High-Speed 12V USB Outlet with Digital Voltmeter for Cars, Boats, Motorcycles, and More - SunnyTrip QC3.0 Dual USB Fast Charger by Eloy Boelkens

I used a 1 1/4 or 32mm rotary cutter and it worked great. The voltmeter is fairly accurate. It is off at 0.03V. I tested this with 2 known voltmeters and slowly discharged the 12V battery to see when the voltage on the solar trip voltmeter would drop. Fast charging works 100%. I tested it with s8, s10 and s10+. I had a chance to test it, but very briefly, with the iPhone 11 pro, and in 14-15 minutes it went from 5% to 23%. S10 went from 32% to 41% in 4 minutes. Results were the same for s10+, 9% increase in 4 minutes. The S8 was surprisingly faster. 14% charge in 4 minutes