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I bought the basic ryobi cordless one, the gauge was for decoration only in my experience - massively different to the measurement on my analogue gauge.
I returned it and bought the next version up that's an inflator / deflator and that one is bang on the same as my analogue gauge. It's been really good for doing the pressures on the rally car at events and stuff.
TL:DR - Buy one but check the reviews before you buy and maybe get a decent analogue gauge separately for checking
Need a tyre pump for the car as my foot pump died randomly today. Which is a bit annoying
I have a mistrust of the electric ones, but is that daft?