Feature: 1. 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. 2. 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 Manometer2 x Hose1 x Connector1 x Manual Note:Saved data, zeroed data, etc. will be erased to 0 together