I've tried AC voltage and it's mostly accurate. Resistance measurements (ohms) will be violated. It reads the same no matter where I set the dial. Shorting two wires together gives 3, 30 and 300 ohms. It seems very unlikely that this could be all. The dial on the left adjusts it a bit, but it's mostly useless. If you turn off the meter and go back to resistance, you'll get a completely different reading. I'm amazed how the counter can be so inaccurate.
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