As well as the individual calibration on the slugs there is another calibration pot inside the Bird 43 feeding the meter movement if my memory is correct. You need to compare the meter and slugs against a known standard or a recently calibrated power meter into an accurate dummy load. Installing a known good slug would allow you to check out the meter body. If it is within 10% leave it as is. "If it ain't broke don't fix it" Bob, G3VVT
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