I've had it for about 1.5 years and it's been used in 2 different cars. Works pretty well for a cheap voltmeter, I tested it with my DMM and it showed an error of 0.05 after adjusting both at idle and with the car off, so while it's not perfect, it's pretty close. Is it as accurate as a SMD voltmeter? No, but on an extreme budget it will work decently and at least give you an idea of what your charging system is doing. There is a slight lag as this counter is not fast enough to keep up with an ever changing load.
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