Review on MCIGICM Digital Voltage Tester, Mini DC Voltmeter 2.5V-30V with 0.28 inch LED Display (Pack of 5) by Sonny Nevers
Works great for 5V+
They are designed for a minimum voltage of 2.5 V (red) to 3.0 V (blue/white). Unfortunately, they don't work that low. The reds and yellows stop showing the correct voltage at around 3.6V each, and the blues don't even show anywhere between 4V and 5V. If you need to monitor voltages over 5V, they're great. Very bright and looks pretty accurate to within 0.1V. Anything else doesn't work though.
- Display: 0.28 inch.
- Not bad
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