Features 1、20.68Kpa Pressure Gauge: This differential pressure gauge adopts ± 2.999Psi/20.68Kpa differential pressure sensor, the maximum allowable pressure is 20.68Kpa, and the accuracy is ± 0.3% FS, high performance digital pressure gauge. 2、With Custom Adapter: Equipped with a rubber head and metal conversion adapter, convenient for users in the auto repair industry to detect and test the pressure of brake vacuum pumps, crankcases, gas pipes, air conditioning and ventilation systems and other components. 3、12 Selectable Units and Wide Applications: 12 selectable units, mmHg, inHg, ftH O, cmH O, inH O, Pa, KPa, mbar, bar, psi, Kgcm ² and ozin ². The two hoses in the gas pressure testing kit are 24cm in length; the thread size of the barb metal connector is 1/8in. Covers pressure units such as metric and imperial. 4、Data Recording and Zeroing Functions: The pressure gauge supports 100 sets of data storage; records the test data function, which is convenient for users to view after testing; the zeroing function with data makes your reading accurate. Low battery reminder is ≤ 6.8V. 5、High Measurement Accuracy: The digital manometer air and gas pressure testing instrument adopts high sensitivity pressure sensor with high accuracy and wide range; high accuracy ADC and low power MCU; maximum or minimum mode and DIF mode. 6、Automatic Shutdown: The digital manometer turns on the automatic power off mode by default every time it is turned on. If there is no button operation for about 10 minutes, the pressure gauge will automatically shut down. You can turn off the automatic shutdown function as needed. 7、Overload Prompt: The digital pressure gauge has an overload indication function, Err, please stop using if this prompt appears, over range use will damage the manometer. In the off state, you can reset all factory presets by pressing the button. Specification Item Type: Digital Manometer Material: ABS + Metal Battery: 1 x 6F22 9V (not included battery) Measurement Range: ± 2.999Psi Measurement Classic; ± 0.3%FSO(25℃) Data Storage: 100 Groups Positive Pressure Range Exceeded: Err0 Negative Pressure Range Exceeded: Err1 Power Supply: 9V Applicable Models: Automotive general purpose, industrial equipment, etc. Package List 1 x Manometer 2 x Hose 1 x Connector 1 x Manual