I have used the inexpensive digital panel meters for years and not found them to be significantly inaccurate or unreliable, as verified by using a good digital meter. But they need to be wired thoughtfully, as nicely shown in Capt. Mike's blog. A large source of errors can come from using a "common return" point away from the source of what you are measuring. Additionally, using shielded twisted pair wire where you need to put the meter a distance from the measurement point can be helpful to shield the input to the meter from electrical interference which can lead to inaccuracy.
A quality digital meter is the best investment you can make. A basic Fluke can be had for around $150 and will last a long time. The two Flukes I have, going on 30 years, are still as good as when I bought them!__._,_.___
Posted by: John Acord <jcacord@gmail.com>
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