You will want to have useful items on your keychain such as the Mini Tire Gauge. The 3 1/4 inch gauge will measure up to 50 PSI. The item is made of aluminum so it is guaranteed to be durable. Attached to the gauge is a strong clip that will attach to any keychain for you to take anywhere. That's not all you can also have a message or your business or company logo included on the product's available imprint area.