more details please contact us product description:cri 250 piezoelectric injector tester can drive the piezoelectric injector and test the ahe, resistance; capacitance; resistance;1. piezoelectric crystal resistance;2. piezoelectric crystal capacitance;3. insulation resistance of piezoelectric oil injector;4. dynamic travel of piezoelectric crystal;5. drive the piezoelectric oil injector;function . on/off knob,a.press the on/off knob:run or stop,the lower right corner of the screen shows the current status:on/off;b.turn the on/off knob left and right:in mode 1, 3, 4, adjustable voltage value: 0 ~ 178v;in mode 5, the pulse width can be adjusted; 0 ~ 5000us2. mode knob3. press the mode knob: enter the submenu, or return to the main menu;4. in mode 5 rotate the mode knob left or right to adjust the injection frequencyback view① power socket: ac: 100-240v;② piezo injector drive harness;