Using this tester, you can easily adjust the injector opening pressure. 1xDiesel Injector Nozzle Tester. Nozzle connection: M14X1.5-M14X1.5, M14X1.5-M12X1.5. Pressure range: 60 MPa (600 bar). This device is suitable for all diesel injectors except CDI injectors and pump injectors.