Digital DC Voltmeter Two-Wire Power Tester LCD 4-30V High Precision with Reverse

bought a couple of these to monitor my Moho batteries. Haven't got around to fitting them yet but tested out on bench. Seem good, there's a pot' to adjust the voltage display so I calibrated to my DVM

Simple to fit in a panel. I used this on my boat to enable me to keep a check on my auxiliary battery which basically powers my lights and bilge pump. Wired direct through a switch (as there is no point running it continuously) it is easy to check that the voltage hasn't/isn't dropped[ing] too low. In fact I'm thinking of using a momentary switch so it doesn't get left on.Simple but well made design. If there is any criticism the weak point is the very small slightly fragile power connector and the lead could do with being a little, even 5cm, longer.That said it works and does the job it was bought for well.