Review on DROK Waterproof Digital Voltmeter Voltage by Jon Lewis

Blue 3 digit voltmeter works fine. But after a week, the plastic sticker on the front deformed and peeled off. I contacted DROK to replace the plastic stickers as the installation took an hour and I don't want to replace the whole voltmeter. I don't know why it deformed. It could be high humidity. I have requested some replacement stickers in case this happens again. That issue aside, the voltmeter works very well and looks good. As a note to others, if you use a switchable positive relay you will see an approximate difference in reading - 0.25 - 0.3V compared to connecting a voltmeter directly to the +- battery. In this case you need to install an inline switch It was to avoid parasitic discharge of the battery. I confirmed the above voltage difference with a handheld voltmeter. I'll probably leave my setup as it is now and just add +0.3V to the reading to get an accurate voltage reading.