1. The voltmeter and ammeter display the output voltage and drive current in real time 2. 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. 3. You can also reset the factory parameters according to your needs; Including changing the default function of power-on, the initial speed of the stepper motor; The initial frequency and duty cycle of the solenoid valve and injector, the initial frequency of the Hall and magnetoelectric signal, the initial frequency and duty cycle of the PWM signal. Drive test function: 1. Test the excavator throttle stepper motor. 2. Test the urea pump stepper motor. 3. Test other small stepper motors. 4. Test the PWM controlled speed regulating motor. 5. Test common rail injectors, 6. Test various solenoid valves, such as metering valves, proportional valves, etc. 7. Test engine throttle actuators Application areas Construction machinery, agricultural machinery, truck maintenance and inspection Usage tips: 1. The power supply of this instrument is DC 12-24V, do not exceed the voltage range, 2. This instrument is a special maintenance equipment for construction machinery, agricultural machinery, heavy trucks, etc. Non-professionals, please use it under the guidance of maintenance technicians. 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. Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Colour:Black Material:plastic Package Contents: 1 x W10 Excavator tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.