Accel's Pro-Tire gauge is developed for professional race or high performance street bikes where high quality and accuracy within 2% are mandatory. The large, 4" (10 cm) diameter stainless steel case protects the brass bourdon tube mechanism, which insures repeatability. Easy-to-read scale on 0-15 psi (0-1.03 bar) gauges is calibrated in 1/2 lb. increments. The 15" (38 cm) long hose is ideal for the biggest custom wheels, and built-in plastic handgrip, air bleed valve, and swivel chuck make it easy to adjust tire pressure quickly. The separately available black rubber cover with molded ribs around the outside of the cover provide excellent protection from accidental drops and bumps at the workshop floor or race track.