I use this on my car, have checked it against calibrated garage gauges and it is totally accurate. It holds the tyre pressure reading until you press the button on the side to release the internal pressure and reset the needle to zero, so there is no rush to read the gauge whilst on the valve. - NOTE it only works on car-type valves (schraeder valve?) and uses a tiny amount of air. We used to use similar on aicraft tyre pressure checking but they were running at about 150psi or sohi all have alde and just bought a lidl track pump both seem to differ a lot as regards the pressure guage.
looking for stand alone guage suggestions rather than me pinching the tyre
ebay if possible