1Data Recording Function: The digital manometer can record 32 pieces of data, every time you press Store key, the instrument stores data once up to 32 pieces of data. 2Display Backlight: In order to improve battery life and energy saving of the instrument, the instrument backlight is triggered by the button, and the backlight can be triggered by pressing any key in the normal measurement mode about 60 seconds. 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. 5Wide Application: 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.