
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.

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