Going off road in you Jeep JL? You better air down those tires to 15psi quick! Don’t be the guy with a key trying to deflate all his tires while all your buddies wait for you. This can deflate a tire in just seconds, allowing you to know exactly what the current psi is. Throw this in the back and get going! Best of all you can get it on Amazon for less than $28 bucks.