... workable to add on the body 4. high quality Mini tire gauge with key-chainSize: approx.3.5" x ... pound per month under normal conditions. Proper tire pressure improves gas mileage, handling, braking and durability. ... must be worn when using this gauge.Do not exceed maximum pressure on dial.Dropping or severe jarring ... Hot selling, pencil type, mini tire pressure gauge, top quality, auto accessory, SMT1302