The gauge is hermetically sealed using a polycarbonate, shatterproof window, sealed to the stainless steel housing with a Buna N rubber gasket. The window will handle 300 psi air pressure without damage. They are made using 304 stainless steel, brass and shatterproof, polycarbonate materials. The gauge has a one year warranty for material and workmanship. Proof of purchase is required.
Check gauges when tires are cold.
Use between 60 and 120 psi. Hand tighten only. Adjust tire pressure while the tire is hot. Use on rubber valve stem. Use over 120 psi.