Dear Stuart Weitzman Thank you for contacting FOBO, Kindly turn on Gauge pressure in the general setting page and check pressure reading for both sensors if you are living in high altitude, Gauge pressure is the additional pressure in a system relative to atmospheric pressure. If you observe a difference in the tire pressure reading at high altitudes, this is because FOBO measures in absolute pressure minus 14.7psi (equal to gauge pressure at sea-level) and is not affected by the change of atmospheric pressure. Please let us know how it goes and contact us by drop an email to FOBO@salutica.com.my Best Regards Amir Bayati FOBO Support Team

Thanks Amir, I turned on the Gauge Pressure setting, but it still shows less than what is there. I have my rear tire at 42psi, but it is reporting 39.6, and the front tire is at 40psi, but reporting 37.6. I am in Nevada, altitude of 2000ft, so that shouldn't make a difference... Analog gauge reflects correctly. Thanks, Stu

We are having the same problem 1-2 lbs difference from guage.

After a few years of proper readings, it's now showing 4 or 5 lbs less than actual pressure. I want to try and release the sensors but don't have the release function on my app