Once again ThinkGeek arrives with the perfect thing that you never knew you needed until you see it. This little keychain fob with the quick-release is actually a 6-in-1 Tire Pressure Gauge Multi-Tool. It has a tire pressure gauge and color-coded depth gauge. The depth gauge can also be used as a bottle opener and a flat-head screwdriver. It also has a push-button LED flashlight that promises 100,000 hours of light. (I guess the 6th tool is the keychain quick release.) The 6-in-1 Tire Pressure Gauge Multi-Tool is $9.99, cheap enough that you can leave one in the glove compartment of each of your cars.
Some of our links in posts like this one are affiliate links, which means that we may receive a small commission on purchases at no cost to you.