Give them the essential tools they need to stay safe on the road all with the convenience of always having it handy with a keychain attachment. This practical auto accessory is very useful in your driving, with large LCD display for easy reading, and high precision and repetition. These make excellent promotional tools for dealerships, gas stations, hardware stores, car washes and so much more.Great for auto body shops and mechanics, select this one of a kind key chain as your next giveaway and gauge a successful promotion!