📟 LM YN Digital AC Voltmeter: Accurate Voltage and Frequency Testing with LCD Display - 2 in 1 Meter Tester Review

There are many voltmeters in my project and this one compares well with them. To check the frequency I temporarily connected it to the house voltage and got 60 Hz. Used to control the generator speed under different loads.

wanted to see voltage and frequency. The voltage part is pretty accurate, but the frequency part usually shows "1" instead of the actual frequency. Sometimes the frequency is displayed, but not for long. Buy one that is better quality than this one.

Bought to test what's coming out of my backup generator. Out of the box it is top notch in both voltage and frequency. The voltage matches my calibrated Simpson 260 and when plugged in it registers 60.0 Hz. There was no warm-up time (contrary to some other manufacturer's gauge reviews) and it didn't drift at all in 48 hours of use.

Bought to measure the frequency of my backup generator. I live on a ranch and the power goes out all the time. I have found that my alternator frequency is around 60.5Hz at light load and around 59Hz at full load. I find that very reassuring. I connected the meter when I had AC power and it ran stable at 60.0Hz. Good calibration check.

Exactly what I want. I bought it to keep my propane backup generator running during a power outage. I have a modest (4kW) generator to power basic functions and it is important to know that the generator can handle starting an induction motor and whether the generator can maintain the appropriate frequency and output voltage for fluctuating demands.

After reading the reviews I bought this gauge to monitor the power output of my old Honda alternator. As mentioned in other reviews, I had to build/adapt a junction box to accommodate the meter and electrical connections. Now I can connect this gauge to the spider box and control the generator output from my living room. (Yes, I'm Edison in Southern California, so we regularly lose power in the summer.)

This is the BEST AC Voltage/Frequency Meter you can buy from Revain. Well designed, easy to connect - only two wires to the source (120VAC) and EXTREMELY ACCURATE - excellent calibration - right on the nose! Matches my expensive Fluke true RMS multimeter with an accuracy of 0.1%! Remember that this is an AC voltmeter calibrated to mean RMS value, so it is absolutely accurate on sinusoidal (sinusoidal) signals such as those from your utility. However, it can be inaccurate by a few percent when…

I bought this specifically for the frequency monitor which works great and showed my 60hz inverter outputting 50hz. This was later verified with another device - the frequency measurement between two meters differed by 0.2 Hz - negligible in this price range. Unfortunately, the voltage measurement is deactivated at 15 volts. Several other counters report 115-117v. This meter reports 98 to 100V. I haven't tried using a mains powered meter - just hooked it up to a supposedly pure sine wave…