Review on AC Voltage Display: DROK 3pcs Digital LED Display Voltmeter for AC 60-500V Voltage Monitoring, 110v 220v Volt Detector with Green Red Yellow Signal Indicator Light Panel by Ryan Noble

I needed a way to monitor the voltage in an air conditioner, both the thermostat control voltage and the compressor voltage. They worked great and I assembled them into a small AC unit monitoring station. The accuracy at the low level is only about 10%, but that's not a problem as I was looking for a relative value first. In my application, all of the meters operated in the full range of 28 to 240 VAC. They have good bright displays and are easy to read. Very easy installation and simple but stable cable connections. Just a small problem. Meter indicator with yellow lenses. They flash once per second when measuring voltages below 48 VAC. I don't know why and when I needed a yellow lens with a low voltage meter configuration I just swapped the lens for one of the other meters. Overall very happy with these little gauges. They don't represent high accuracy or accuracy, but for quick diagnosis and troubleshooting, as well as continuous monitoring, they're a great tool.