The special 2-1/4" gauge has two multi-colored bands - idle and 2500 RPM, with pressures shown in PSI and bar. All included in a plastic blow molded case. Includes a hose 6 ft., which is enough length for the technician to test from the drivers seat Enables technician to test exhaust back pressure through oxygen sensor adapter, includes M12 and M18 thread. The special 2-1/4" gauge has two multi-colored bands for idle and 2500 RPM, with pressures shown in PSI and bar. The gauge is furnished with a rubber boot to protect it. Works great for any technician.