1.Straight head 2.Chrome-plated zinc head, metal tube 3.2 or 4 side plastic bar 4. ... Pressure range: 10-50psi or 10-100psi Straight head tire gauge·Chrome-plated zinc head, metal tube·2 or 4 side plastic ... .Dropping or severe jarring may impair accuracy of gauge. Straight head tire gauge, pencil type tire gauge, 10-100psi, SMT1162 ...