111 Units: Digital differential pressure gauge has 11 selectable units of measurement, mmHg, inHg, ftH?O, cmH?O, inH?O, KPa, mbar, bar, psi, Kgcm2 and ozin2. 2Pressure Sensor: Differential pressure gauge adopts high accuracy pressure sensor, high sensitivity, fast measurement. 48 sets of measurement data can be recorded. 3High Strength Abs Shell: The shell of the differential meter is made of excellent Abs material, which has high strength and long lasting durability. 4Portable Gauge: Digital differential pressure gauge is small and compact, easy to store and carry, convenient to use when going out to work. 5Application: For the auto repair industry to detect intake manifold vacuum, test the brake vacuum pump, exhaust pipe, waste valve, crankcase, gas pipe, air conditioning ventilation system and more.