Features: 100% brand new and high quality The ability to easily detect and configure the servers virtual spaces, jitter and median. Can be connected to two servos or ESC; MCU control, good stability and high accuracy. Turn the knob, steering can be detected. If you connect electronic governor (brush or brushless available), you can get rid of remote control devices for manual speed control, used to test tone. Speed or motor performance is very practical, no longer cumbersome to connect the remote and the receiver. It is equivalent to a hand Moving receiver function, analog transmitters to play through the rudder knob. 3 Adjustment ways: manual, automatic, and the median. Instructions: Refer to the picture, left steering, divided on the lower three groups, which can be accessed three servos; Right single row of pins connected to the supply, close to the edge is negative (to see identification symbol), then the battery negative, be careful not reversed, if the power supply is reversed will burn IC; S identifiers corresponding to the pin, it does not matter. Power on, the blue light will illuminate simultaneously, and then only light left of the first one, in order to manually adjust potentiometers test, press the button, the middle lights, the normalized test; Third lights, automatic testing. ESC test connection and access servos, as you must first take the test motor ESC Package Includes: 1PC x Servo Tester Specifications: Output: 15mA (5.0) Input: DC 4.2-6.0v Output Signal: 1.5ms 0.5ms Size:approx 3.5 x3.2cm /1.38x1.26 in Weight: 8g Adjustment: manual, automatic, and the median. note: This tester can not test the servo more than 55 grams servos. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you Please allow slightly measuring deviation due to manual measurement.