[Porschekid962]

get an Intercomp, the Longacres leak fluid if you get the oil filled ones but either way I have noticed they go out of calibration after repeated usage. I calibrate mine against an Intercomp digital pressure gauge just to make sure, then I bought an Intercomp and now I dont have to worry that when I am bleeding tyres to 15 psi that im not at 17 and when the car goes on track instead of running at 25 psi it will be at 22psi where the tyres are happy.