Vtonsports tire deflators are devices used to automatically reduce the air pressure in your vehicle’s tire to a preset level. They are particularly popular among off-road enthusiasts who need to lower their tire pressure for better traction on sand, mud or rocky terrain. Due to simply dialing design, you can set the deflators at different pressure easily in seconds. They will accurately and consistently deflate each tire and stop automatically at the pre-set PSI. If you frequently airdown for offroad adventures, then you must have vtonsports automatic tire deflators pro version. They will saving your time and knees a lot and make your offroading more enjoyable. Each deflator comes factory pre-set to 20 PSI and can be used right out of the box. A set of auxiliary scales with increments of 0.5psi which can help people to easily get accuracy within 1psi over different tires or gauges.