JLM Digital Manometer is a compact and useful diagnostics tool to measure differential pressure in diesel particulate filters. Kit includes Heavy duty zip up pouch, Spares hoses, Fittings and instructions. JLM Manometer measures pressures from 0 mbar to 7500mbar in units such as PSI, Mbar, kPa and more. A digital manometer will give you a second reading to help verify the pressure sensors of an engine. If your diagnostics tool and manometer read different values your sensor is likely faulty and a cause of other problems. This makes a digital manometer a must have diagnostic tool for any mechanical trade professional working on modern engines. To measure DPF pressure simply connect the manometers positive (+) terminal to the DPF's front differential pressure sensor and record the values of the engine while idling. Be sure to re-check the pressure after cleaning or regenerating a DPF to be sure that it is clear of pressure.