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Gauges Need Calibrating After Only a Few Uses

rusty_ratchet on Sun October 11, 2015 12:20 AM User is offline

I recently purchased the Mastercool 98661-PRO gauge set. I've only used it a few times and the low side needs to be calibrated. With nothing connected it shows around 5 psi.

Is this normal or do I have defective gauges?

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