This video by Gary Galka from DAS/Pro-Measurement illustrates the correct procedure for calibrating your Mel-8704R and other Mel Meter related Paranormal Instruments. Proper care should be taken to ensure that there is NO residual EMF present in the environment when performing this three step procedure.
In essence, you are performing a straight-line equation, ( y = mx + b) or “slope-intercept ” calibration.
If done correctly, the Mel Meter will read “0.0 ” on the display.
Note: This calibration technique (Mel-Cal) will not resolve reading errors resulting from mishandling, damage or abuse.