W10 excavator tester and EGR-8 tester have complementary functions It allows technicians to quickly test, verify and troubleshoot EGR and turbocharger electronic control valves on-site, reducing downtime and improving maintenance efficiency. The instrument has been set up with various parameters at the factory; Including: throttle stepper motor speed, solenoid valve frequency, injector frequency and duty cycle, no tedious adjustment, direct use. Its 8-pin interface is engineered to match common electronic valve harnesses, helping mechanics perform accurate functional tests, identify faulty valves and confirm repairs without repeated disassembly. Note: Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure the item is what you need., Manufacturer: Akfldms