I have used this type with different vehicles over several years, they are pretty accurate and reliable. You do have to keep them square on to the valve but this isn't difficult. The only downside is that the rubber seal will eventually perish and you'll have to replace the unit, but having said that they are the best small type I have come across in my 34 years driving.
I had trouble getting a good seal the first few times I used it (in the dark); no problems in the daylight. The reading was consistent when measuring repeatedly the same tyre. I had bought it to measure the pressure in mountain bike forks since the gauge on the pump was not very precise. Unfortunately the small chamber inside the fork means that the act of measuring lowers the pressure significantly (in my case by about 10psi) even though there was no hiss of escaping air.
Defi style gauges are fully digital and feature an opening sequence gauge sweep, as well as storing and displaying peak values and having an adjustable warning setting. Available in your choice of blue or white backlighting. These are a standalone gauges that can be used in almost all cars, and include a gauge stand. Oil pressure gauge measures engine oil pressure. Size: 60mm
Bleed air duct pressure indicator (dual needle). Air temperature indicator. Cabin altimeter and differential pressure indicator (dual needle). Cabin rate of climb indicator. APU exhaust gas temperature (EGT) indicator. Fuel temperature indicator. Hydraulic brake pressure indicator.