Although we always recommend double checking against other trusted standalone pressure gauges, it often times isn’t always needed because the gauge on your deflator was factory calibrated within 1.5% accuracy and certified to ANSI B40.1 International Standards.
That said, we have a few troubleshooting steps:
#1 - When you are reading the tire pressure, please note whether it is inaccurate as the "slide valve" is pulled towards you (during deflation) or when the slide valve is pushed in away from you and towards the tire (not deflating)? The gauge shows the true pressure (within specs) as the slide valve is pushed forward and no air is being released. While it is pulled out and deflating it will show a pressure much lower.
#2 - Please consider the tire pressure range you are trying to operate the unit at (for example airing down from 35 psi to 17 psi)? The gauge will operate best in the 12-40 psi range, but should still be accurate within very low pressures 6-12 psi.
If the above steps do not address your accuracy issue, please let us know you tried these steps and we will issue you a free replacement. We usually don’t have accuracy issues with any of our gauges and we sincerely apologize for your troubles and will make sure to take good care of you either way.
This gauge uses an internal bourdon tube mechanism to read pressure, and sometimes harsh impacts or vibration can throw the accuracy off. We do our best to prevent this by adding a rubberized protective boot around the gauge and additional shock-absorbing features, but sometimes accidents happen either during delivery or out on the trails.
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