Review on DaFuRui Digital Voltmeter Two Wire Voltage by Dylan Aaronson

Nice little voltmeters! The box they came in was unexpectedly bougie, but let's just say that speaks volumes about their quality. I put liquid tape on the back of the voltmeters I used to protect the back solder joints from shorts, but other than that I got exactly what I was hoping for when I bought these voltmeters. separate power supply, are not expected to be of great or perfect accuracy but for the most part they seem to measure accurately (see photo uploaded - claimed 11.8v while a voltmeter with separate battery showed 11.95v). The photos show how I used these "mini voltmeters" - I extended their positive/negative ends and terminated them with a 5.5 x 2.1mm barrel connector and I reconnect this lithium ion battery /ab when I want to check the voltage level of the battery (to determine if it should be charged or not). All this to power a secondary amp (also purchased from Revain - a Facmogu F900, yes it's too much for the speakers I used it for but I keep the volume on it accordingly) to get sound on to send the Bose SoundDock. A Series II speaker that was gathering dust and that I wanted to make useful again (removing the plug dependency and adding Bluetooth capability). Fun little project, I feel like the result was exactly what I wanted and this product helped bring it all together!