The AUTOOL Digital Cylinder Pressure Gauge utilizes digital sensing technology and high-precision chips to display pressure values. Equipped with a one-way valve, it accurately locks the maximum pressure value of the cylinder. Comes with various connectors to support cylinder pressure testing for most engines on the market. Includes a data storage feature that records six sets of pressure measurement data, facilitating comparison and observation to identify fault points. Users can switch between pressure units psi, Bar, and kg/cm², and temperature units Celsius and Fahrenheit. One-key data locking prevents accidental changes to readings. The HD 2.8" LCD backlight display ensures readability even in low-light environments. Comes with a toolbox for storage.