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Bought this voltmeter to plug into the dash outlet on my 2014 Polaris Ranger UTV, since the last thing I want is to be stuck by a low battery somewhere farther into the boonies than I care to walk back. Simply plug in like any other cigarette lighter port-powered accessory, and it lights right up showing ambient voltage. Then it flips through two other functions: temp and amps drawn by the devices being charged by the USB outlets. Frankly, I'll probably already have a jacket if the temp readout tells me it's chilly(!), but amp draw of cellphone and GPS -- never crossed my mind. Then, quickly enough it's back to show me battery status, once again. Should my cell phone, tablet or GPS need charging, it will handle that, but I still need to remember to bring a cable if that's my intent. Bright enough to read in daylight; not so bright as to be blinding at night, the soft blue numbers are easy to read. What's even better, they seem in agreement with my hand-held multimeter, which is reassuring. Would definitely recommend purchase if voltage is a function you wish to monitor.Read full review
Verified purchase: Yes | Condition: New
The digital volt meter display has a Cool Factor off the charts. If you can not glance down and see awesome glowing digits on your car charger then you are behind the times. This car charger and its awesome display lets you know that you are charging without any "guess work". You have enough to do operating a vehicle then to be fiddling about with your non-display car charger. Get with the times Man!
Verified purchase: Yes | Condition: New
You don't really have to do anything but plug it in. It seems pretty accurate. It's conveniently efficient to keep track of various things while being a charger as well. It does stay on whole the car is off, which doesn't seem to be a problem but it might attract attention from the led (you can just take it out and put it under the radio or something).
Verified purchase: Yes | Condition: New
Works great. Shows input voltage, output amps, and temperature.
Verified purchase: Yes | Condition: New
Works as advertised excellent product
Verified purchase: Yes | Condition: New