Seems to be accurate. I compared the voltage readings to my calibrated flow and they are very close to less than 1/4 volt. AC amplifiers seem very close to my plug in a wattmeter. I have no way of comparing DC amps, but they seem to give the numbers I would expect from tested hardware. Great for checking the inverter load on my boat's batteries. The AC starting current characteristics are of great help when dimensioning a generator for the starting load of AC motors.
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