KETOTEK Digital AC Voltmeter Panel Mounting Meter AC80-300V Frequency Counter 45.0-65.0 HZ LED Display Voltage Volt Frequency Meter Tester Gauge

I bought this unit to see how well Texas' now-notorious electrical grid is keeping up with demand during this arctic weather we are having here at the moment. Line voltage and line frequency both 'sag' when generators are struggling to keep up with demand, but so far so good (fingers crossed). I have also been monitoring the U.S. Grid via FNET's website which shows the instantaneous frequency in various U.S. regions, and this little meter is accurately tracking these changes (to one decimal place) as they occur in Texas' grid. Technical note: this meter truncates the frequency measurement at the first decimal. It does not round the value, and so if the line frequency is, say, 59.999... Hz, it displays 59.9 Hz, not 60.0 Hz. This is preferable because otherwise the frequency would always display 60.0 Hz except in cases of a serious grid fault. Line frequency typically varies less than 0.01% under normal conditions. Very nice little meter. Accurate, looks well made and has a nice, bright display, all at a great price. A solid five stars for this product.

Perfect replacement for my 30 year old Heathkit 2203 Line Voltage Monitor with the added bonus of a frequency counter. A great generator monitor. Measures 0.7 volts low against my Fluke meter, though it is not an average voltage, in that 121.9 volts still reads 121. Working on mounting it in a Zulkit 3.94 x 2.68 x 1.97 inch (100X68X50mm) project box. Overall, I am very happy with it.

Works as claimed and good quality display. 2 wire AC connections are simple with no regard to polarity. I epoxied wires at the connection for added stability.

I purchased for the purpose of utilizing as a HZ meter. Does its job but just keep in mind it’s very small. Looking at the picture I thought it would be larger. Just check the measurements. Functioned with no issues.

I installed these to Monitor, a whole Home UPS running 240 V. In addition, I can also Monitor the 120 side for my generator to ensure that I’m not overloading it These are bright, easy to read. Even pull daylight, and will Monitor, Your kilowatt hours, If need be, they have an excellent, so far after almost a year of constant use

I purchased this to use as a voltage/frequency monitor on the house's incoming 120/240V single-phase electrical service. I punched out the appropriate sized hole in a 4-11/16" blank box cover and mounted that on a box above a split-wired double duplex receptacle fed by a double pole 20A circuit breaker. Although it's not directly fed from the line side of the main breaker, I feel that the accuracy should not suffer. I checked the unit against my FLIR DM93 multimeter and the panel meter was spot-on with both voltage and frequency. The display is bright enough to read from a distance. The wire terminals are small and I used some 20 gauge stranded wire that I had hanging around. Good accuracy, easy installation, inexpensive price. All good reasons to purchase this meter.

Accurate

I added this to my backup generator to indicate that everything is operating as it should. Works great!

The voltmeter and Frequency counter was very easy to install and worked great.