1、It can connect 1‑3 servos simultaneously and test such as 1‑3 servos consistency ,also can compare their reactions time respectively. 2、There are 3 modes to check servos or ESC, such as manual mode, neutral mode, automatic window wiper mode. You can choose the mode you need according to your needs. 3、Manual mode that turn the knob with different speed, check the reactions time. Neutral mode that make the servo go back to the neutral point. 4、Automatic window wiper mode that make the servo swing like a window wipers in the biggest angle, it is very practical. 5、It is made of high quality aluminum alloy shell, durable to use, light in weight, safe and reliable, button operation is convenient. Item Type: Servo Tester Material: Aluminum Alloy Color: As shown in the picture Input Voltage: DC4.8-6v Manual Mode: Turn the knob with different speed, check the reactions 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. 1 x Servo Tester