The car's lighting was checked by a professional electrician, everything seemed fine. I believe that it measures volts accurately since I checked the battery with 2 professional multimeters and compared them. However, after a month of installing the non-daily use instrument in the car, it suddenly stopped measuring volts, causing the needle to be down as if it was turned off while the lighting continued to work normally (the electrician judged that it was a faulty product since we gave it power and it did the same). Such a shame

As soon as I received the product, it had a problem with its lighting. I ignored it and had a professional car electrician install it in my car. After 1-2 months, it started showing 0 volts even though the battery obviously had no problem. I took it back to the same electrician and he informed me that it had broken. Such a waste of money I spent!

It never worked from the moment it came out of the box. It's like something is preventing the needle from going up. I blew it with compressed air at 8 bar and still it didn't move at all.