Servo Tester Features: There are 3 modes to check servos or your ESC: Manual mode: turn the knob at a different speed, check the reaction time; Neutral mode: make the servo go back to the neutral point; Automatic "window wiper" mode: make the servo swing like a window wiper in the biggest angle. It can connect 1-3 servos simultaneously and test such as 1-3 servos consistency and so on. You can also connect 1-3 ESC to test and compare their reaction time respectively. It can connect 3 servos of the CCPM helicopters and select servos. It can also connect the servo of airplanes install the steering box and adjust planes by using such as the neutral mode and so on.