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Reviewed in the United States on March 2, 2025
I ordered the two wire volt meter version. Accuracy was good and the price was obviously good. I just wish the meter had a bezel to make mounting in a hole cleaner. Current load on the voltage source was about 6 to 7mA but other sources say this is typical and could be as high as 20mA.However, these can be converted to three wire versions and not place a load on the voltage being measured. See picture. Red (positive) and Black (Ground) go to external power (e.g. a battery) and the yellow is the voltage to be measured (with respect to ground.In my case the voltage to be measured was 3.7V and the external power source as also 3.7V. With the meter powered by an external source the load on the voltage being measured was around 0.1uA. I am not sure what range the external voltage source can be and not damage the meter. Your mileage may vary.
Steve W.
Reviewed in the United States on February 8, 2025
Works in forward voltage only. Circuit protection if reversed
P. Meyer
Reviewed in the United States on December 24, 2024
But the leads are on the order of 30ga wire or even smaller, they’re extremely thin. That’s fine but the insulation layer is too thin for any of my strippers. I had to strip them with a razor knife.
R. Kawakami
Reviewed in the United States on September 13, 2023
Update 9/20/23: I bought a set of M2 screws, nuts and washers here on Amazon (Pzsmocn 300 Pieces / 100 Sets M2 Black Nylon Screws and Nuts Kit with Nylon Washers). Just enough room for the nuts to fit against the PCB and clear the components. I would still recommend nylon hardware so that there's no danger in something shorting out.(Original review follows)I'm planning to add these red and green displays to a couple of interface boxes I'm building that powers some IP cameras. I have a mix of 5VDC and 12VDC cameras I'm using so I needed something that would cover this voltage range. One box I have has 12V going in and a couple of USB ports as output. Another box is also connected to a 12V power supply but one output is a constant 12V (powers a WiFi bridge), while the other output is on a time delay which gets power 7 seconds after the bridge does. It would be nice to see what the voltages are going to the cameras, rather than use an LED which would light up as long as there's 3V or so.I connected them to power from a USB port and calibrated each one to match what my voltmeter said (5.05V). There were only a couple of them that initially displayed around 4.90V but all of the others were within 50mV. I adjusted all of them to the same 5.05 using the tiny trimmer potentiometer on the back. After calibration, I sampled a couple of them at 12V and they were fine. I also tested the lower operating voltage the best I could. Two AAA batteries in series is 3V and both the red and green displays lit up showing 3.00. I don't know if they meet the published 2.5V (red) and 2.6V (green) limits as I don't have an adjustable bench power supply but they do at least work at 3V. As I'm planning to use these with 5V and 12V, I'm not concerned with anything below 4.5V or so but I thought this check might be useful to others.Now my problem will be to cut out a rectangular hole in the plastic project boxes I'm using so I can mount the displays. A small hole at each corner and a cutting wheel on a Dremel should do the trick. I didn't see it anywhere here in the product description, but the holes in the mounting tabs look to be a shade over 2mm in diameter so in theory M2 bolts would work. However, the area around the holes are occupied by some components so I don't think you could get a bolt or nut in there. Plus, the holes are almost right in line with the ends of the LED display. The mounting tabs was one of the design features that led me to buy these. It would have been nice to have the tabs a little wider which could allow the holes to be a couple of mm away from the LED display. I may have to hotglue or superglue the displays in place, rather than use hardware.The only other "bad" thing to report is that one of these voltmeters has a semi-delaminated mounting tab; the PCB material has separated in a middle layer but I can probably use some superglue and bond it back together. It didn't affect the operation of the display. Yeah, the display.... They are BRIGHT. I wish that there was a way to turn down the intensity but I guess it's better then being too dim to read.
muffslayer
Reviewed in the United States on May 11, 2023
I love them, high quality and dense to hold! However, One of the lines on the LCD’s had a burnt out upon arrival. Other than that, i would consider purchasing again!
DeputyDaves
Reviewed in the United States on December 30, 2023
The media could not be loaded.
Purchaser
Reviewed in the United States on November 26, 2023
8 of 10 did not work. One of them was a short that damaged other components. Taking the time to test each product is an unfortunate reality when there are makers and sellers willing to ship non usuable product. And Amazon, your return process for obvious inappropriate product makes it very hard to do business with you. This kind of product should not require customer time and effort to return. There should be an immediate credit without return. There is no possibility my experience with this product is a rarity.
Power User
Reviewed in the United States on February 25, 2022
These are useful small panel meters, I expected ballpark accuracy and that's what they are. 3% is the spec, and that is ballpark on my book. They are adjustable so can be "calibrated" but bear in mind at the specified 3% accuracy, the thrid digit is just close. These are indicators, not test equipment,They were perfect for the small dual rail tracking bench (not lab) power supply I built. It is much more accurate than the meters but in the rare case the circuit under test needs more accuracy than these little meters... bench DVM.All five meters work. I opted for multiple colors so I can tell at a glance what/which quantity I am observing. Three wire meters were also needed for my application because I wanted to measure close to zero (0) Volts and over 40 volts.When i need more I will not hesitate to get more of these.
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