This tire gauge is a flashlight and also a key chain. Now every time you grab your keys you will be reminded to check your tire pressure. Proper inflation saves gas, maximizes handling increases tread life and improves safety. This compact design works great on most tires from your wheelbarrow to your 3/4 ton truck. Having a handy LED flashlight at the ready can save the day, or at least the quarter that rolled under the restaurant table.