Milton (S-928) Air/Water-Filled Tire Pencil Pressure Gauge INCLUDES: Built-in deflator valve on this and all of Milton's single head pencil gauges. White nylon indicator bar. MILTON: Pencil Gauges made with machined parts, unlike our competition! IDEAL: For tractor or air/water-filled tires, and handy in cold temperature weather conditions. MEASURED PRESSURE RANGE: PSI (5-50, 1-lb. increments) and kPa (40-350, 10-kPa increments). CAR SAFETY/MAINTENANCE: Always check tire pressure when tires and temperatures are cold.