1. It has three modes to detect the servo or ESC.Manual mode-----You can turn the potentiometer at different speeds to measure the reaction time.Find neutral point mode---- Return the servo to the neutral point.Automatic two-brush mode----makes the servo swing in the angle of two brushes. 2. You can connect 1-3 servos at the same time and test the synchronization and consistency of 1-3 servos. 3. You can connect 1-3 ESCs at the same time and test and compare their respective response times. 4. It is possible to connect three servos of a CCPM structure helicopter at the same time, and use the neutral position and synchronization functions to debug helicopters and servos. 5. It can connect the steering gear on fixed-wing aircraft and use functions such as neutral position to install the steering wheel and debug the aircraft. Input voltage: DC4.8-6V All aluminum alloy casing, anodized, can test analog and digital servos, can control ESC (motor stepless speed regulation test), and can test whether three servos are synchronized at the same time (this function is mainly suitable for helicopters in CCPM mode steering gear) Due to different batches, there may be differences in the appearance, color, and printing of the product, which not affect its use. Colour:blue Material:Aluminum alloy Package Contents: 1 x Servo 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.