Attention. Although they are presented as one product, they are actually two different ones that do the same job. One is the VST & the other is the DoFULL. If you look at the pictures, you will see that one shows the Volts first in blue color & the other shows the temperature first in blue color. I don't know if it is possible to order a specific one or if it is a matter of luck which one you will finally receive. I got the DoFull. It does its job well. Its body is quite deep & for that reason it sticks out a bit from the position where the car lighter was. I have not tried it as a charger. I noticed a deviation of +0.2/+0.3 V compared to the reading it gives & the reading a good multimeter gives.

Very good, it is what I wanted, I can see the battery's charging progress exactly, Immediate response.....

Simple but good accessory for indicating the car battery and the alternator charging while in operation

I haven't needed to try it as a charger, but as a voltmeter and as a thermometer, it works perfectly

It is very good. I have compared it with another thermometer I have and it shows the temperature exactly like the car's volts. Just because the sensor is not external (I mean outside the plastic casing), if the temperature changes very quickly, like when you turn on the air conditioning, it takes a little longer for the reading to change compared to another one. I haven't tested the port extensively (only 2 times), when I test it well I will write about it too.

Very good, readable, and reliable in its measurements. The only negative is that it does NOT charge mobile phones. I used it to charge with the result of overheating and damaging the device. I ordered a new one because, as I mentioned, it is reliable in its measurements. Attention, do not charge your mobile phone or it will burn.

Very honest product. It has a good screen size for the indicators to be easily readable, accurately displays the temperature inside the car, and the voltmeter is also accurate. The connection is simple. You place it in the car's cigarette lighter with the switch always off, and after making sure it is inserted properly, you turn the key and it works. A simple and useful tool that enhances the console with its digital indicators. It is also bright enough to be visible even in strong sunlight.

Very good!!! It's worth it..

Used in a 12V machine socket. Works perfectly and the air temperature deviation is +- 1 degree. Very honest for the money.

Very useful tool for those who want to monitor the battery at all times

It is very good and very fair for its price. The temperature and voltage indications seem to be accurate and the brightness is also intense. Even in bright sunlight, they are easy to read.... I haven't tested the charging yet.... overall, it's a tremendous value for money.