Tyre Pressure Gauge me please

[g5guzzi]

So when you get them calibrated do you find that they are out or quite good each time, in my search I have seen the blue point talked about.

They have always been spot on ln the 30 to 40 range.One registered 1lb out at 100 psi the other only goes to 50 psi.Both gauges are analogue l have never had a digital one tested yet.


Malcolm