This tire gauge keychain, aluminum construction, Calibrated from 10 to 50 psi and accurate to +/-2 psi. Small, compact, light wieght,multi colors can be choosed. Ideal for tire, transportation, keychain, travel, comping, tooling, house hood, real estate and self promos. Choose one of the bold color options and add your logo to this gift for an excellent opportunity to promote your business.