Review on DROK Frequency Electric Voltmeter Multimeter by Bryan Covington

I installed this on a dedicated 240 volt 30 amp circuit to reduce the power draw of an indoor infinity pool to monitor. It seems to measure voltage and current. I'm still checking. But about an hour after the installation was complete, the display began to blank in a very predictable pattern: 88 seconds on, 7 seconds off, repeat. I disabled everything and checked all connections. They are alright. I turned it on and saw the 88/7 scheme. It used to turn on at 60 seconds and off at 7 seconds. Strange. I bought a second one and will see if it's better. If it doesn't work out, I'll send both back. Otherwise I keep the second one and send the first one back. That failure mode aside, this is a good product awaiting further analysis of its ability to accurately measure. If the second one works I'll update my review. Edit: The second worked fine. Obviously the first one was just a lemon. I've upped my rating from one star to four and subtracted one for a lemon.