EASY TO USE. Simple autostop feature allows you to preset the pressure you need, and it will automatically stop inflating once that pressure is reached. Accurate inflation, every time

As well as being capable of pumping up car tyres, this air compressor also comes with a handful of other adaptors to inflate bicycle tyres, inflatables and footballs. Should I buy one?Some inflators have 12V ports so they can effectively be used as an extension lead that connects other accessories to your car’s power. If your car isn’t fitted with a USB port, it’s useful to have a tyre inflator with this feature so that you can charge a tablet or smartphone on the road. Plugging it in and connecting it to your car’s tyre valve is very easy and intuitive, although you might miss that torch function of the 635 if you’re attempting to do it on the side of a dark road. The three-metre power lead unwinds easily and is long enough for most purposes. Tyre pressures are typically between 30psi and 40psi (or 2 bar and 2.8 bar). How to test your tyre pressure

Express delivery option to offshore, highlands and remote postcodes may take longer than the usual one working day. The surcharge may not apply to small items being sent via Royal mail or MyHermes etc... Where possible we will try our best to avoid courier service for surcharge areas. If you want to be equipped for every flat tyre eventuality, the VonHaus Cordless Tyre Inflator has you covered. It will run for up to ten minutes from the supplied 1.5A lithium-ion battery, but if you forget to charge it you can always switch to the bundled 12V adaptor, which comes with an unusually generous 3.5m cable. It has a small, but still readable, digital pressure meter. And you can just set your desired pressure, pull the trigger and let it go to work: it will stop when it reaches the right level. There are a few extra attachments to allow the inflation of bicycle tyres, footballs or inflatables like dinghies or air beds. So if you’re outdoorsy then it’s a worthwhile thing to keep in the car even if you’re not too worried about your tyres. Build quality is sturdy - in our testing we dropped and bashed the unit and while it does have a few little scratches here and there it’s still in one very chunky piece. Should I buy one? It’s noisy, dishing out 77dB in operation. And the pressure gauge can be difficult to read since, because it goes up to 250psi, that crucial 0 to 60psi zone is crammed into the first quarter of the dial. However, it pumped up our test tyre from 20 to 30psi in just under two-and-a-half minutes, with no fuss or faff. It’s a shame that the supplied accessories are so basic – just a ball inflator and two adaptors for inflatable toys – still, if you’re looking to spend as little as possible, then the Storm Force Mini does the job.Larger inflators include rechargeable batteries, which make them completely portable. These are a better option if you want to pump up, say, bicycle tyres, without having to wheel the bike next to your car. You may also need a larger inflator for tyres that need higher-than-average pressures, such as a larger van or campervan. What about extras? The RAC 610 doesn’t do anything particularly fancy - it goes without the torch and flashing light of the 635, as well as the automatic cut off. It’s a small, lightweight device with an air hose that wraps up neatly and a wire to plug into your car’s 12v power outlet. Does it work?

The pressure is usually shown in two formats: bar and psi. There are typically two sets of these. The lowest is for normal use, but you may well see another set of higher pressures for when the car is heavily loaded, increasing the weight that’s pushing down on the tyres.

ALL THE EXTRAS. Includes LED light with three settings (bright white to illuminate, flashing white for attention and flashing red for SOS), three piece valve set for bikes and balls, and case for tidy storage