ICQUANZX2pcs Flat US Plug AC 80-300V LCD Digital Voltmeter Voltage Measuring Monitor, AC 110V 220V Voltage Panel Power Line Volt Test Monitor Gauge Meter for Household Plug into Outlet to Measure.

Easy reading and accurate AC voltage display

I have several inverters on our sailboat, including one that's always on for the fridge. I use these to show at a glance which inverters are active. Well worth it! I found it simple to open the case and adjust the accuracy.

The ICQUANZX 80 - 300 volt digital AC voltmeters work well for me. Out of the box, the two units I received read within one volt of my reference precision Fluke digital voltmeter. After carefully opening each case, I found the tiny adjustment control within each, and using a small insulated screwdriver, I was able to adjust the voltmeter to agree with my reference voltmeter. Now the digital readout is spot-on. The digits are clear and easy to read from several feet away at normal room light levels. I use these to monitor my portable emergency generator's output and to monitor my home's mains voltage. Recommended.

Just plug it in and it works, nice display shows the voltage in big letters.

Works great. Putting one in my camper to monitor voltage at different campsites.Amazon shipping is awful. Zero protection, shipped these in a bag, and of course they arrive broken and I had to reorder.

These devices always read what my thermostat reads. I use these in my RV to show outdoor temp (placed on the outside of my RV under the awning roll assembly, and the other in the interior, opposite side of the thermostat.

Good reference for generator or RV.Reads -2 volts reference with fluke multimeter.

Excellent product, easy to use and delivery was fast