What are they like on tyres the size of those fitted to LRs?

honestly @Nodge68 not sure as i havent tried it on car tyres yet

heres a few reviews you can check out, from the reviews i gathered that its not the best at giving the tyre pressure reading,
but to overcome that i got a digital tyre pressure gauge from ebay for about four odd pound


 
I've owned a similar unit (not the same make) for a couple of years & have to say it's great on tyres up to 205/80x16 ie our 'daily' & my RRC.
The weak point on these cheap inflators is not the battery (esp. Li-iron) or the motor, but the compressor itself. The units end up whirring away merrily, but not increasing the tyre's pressure.
 

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