Tron, you can't simply BS TASC equipment everytime. I have seen you do that often. It's not that if a user/member has bought a product, it is 100% accurate. @theBlack, which service center did you visit? Perhaps, members can provide feedback regarding the quality of stuff used by that service center. Also, you can visit 2 trusted petrol pumps with quality air filling system. Get the pressure checked from first station, drive away (so that person behind you in the que is not harrassed), check air with your equipment. Note down the difference if any. Then visit the second petrol pump and get air pressure checked. Then re check with your equipment. Note the difference. That way you can make out if your device is faulty by comparing the readings of all four checks.