This instrument has been ultrasonically cleaned, then sparingly lubricated with moebious clock oil to provide many years of trouble free service in weather predicting aboard your vessel. Finally it has been precision calibrated in my IDEAL-AEROSMITH calibration chamber to provide complete accuracy.Check out the calibration report for assurance of accuracy.
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THE REASON FOR THE"STRANGE" READING ON THE DIALS OF MY INSTRUMENTS IS THAT I LIVE AT 4400 FEET ABOVE SEA LEVEL. THE AVERAGE AMBIENT BAROMETRIC PRESSURE IS 25.5" or 860 millibars.
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