There are 3 modes to check servos or ESC: Manual mode: turn the knob with 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 wipers 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.CCPM Servo Consistency Master/Servo tester.The device also can be used as a signal generator for electric speed controller (ESC).With it, you can test your motor system without using a transmitter and receiverpackage: 1x testerNote:Light shooting 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.