Review on 📊 Eiechip LED Digital Voltmeter Ammeter: Mini DC Digital Multimeter 100V 10A, Blue Red LED Amp Dual Digital Display Volt Meter Gauge for Car Current Monitoring and Testing 0.28 inch display by Joe Unruh

I've used them on several projects. I used the first one with a bit of blissful ignorance - assuming the values were correct. For the second project I decided to check the values with a multimeter (commercially available) and found that the values were wrong. There are potentiometers to adjust the device. After that, the instrument came much closer to reading the meter as I applied different loads and conditions. Overall I think it's a good, compact and inexpensive instrument. Just check and adjust with a good quality multimeter.