1pcs Rc Metal Servo Tester Electronic Speed Controller Checker Master For RC Plane Car Boat High Quality RC Servo TesterFeatures:The device also can be used as a signal generator for electric speed controller (ESC), then you can test your motor system without using a transmitter and receiver.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.Description: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.Specification:RC Parts & Accs: Servo AccessoriesFor Vehicle Type: HelicoptersMaterial: PlasticVoltage consumption: DC4.8-6VColor: BlueItem size: 46x32x23mmPacket content:1 x Multi Servo Tester