It's like having two watches and never knowing the correct time. It's not easy to calibrate a pressure gauge. If I compare three and two agree how do I know it's not the odd one that is correct? I don't know. I just buy good ones and that's all I can do.
No man has a good enough memory to be a successful liar. Abraham Lincoln
2016 36FBTS Pinnacle
2016 F350, 6.7, 4x4, DRW, long bed
B & W Companion 5th wheel Hitch