Features: Simple servo tester can quickly test the performances of servo motors to ensure their normal operation. This is a very simple tester suitable for testing the performances of electronic speed controllers or motors in servo testers. Can connect 3 servo or 3 motors for simultaneous testing. Equipped with 3-gear indicator lights. Controlled by a microcontroller, good stability and high accuracy. It is easy to detect and set the virtual position, vibrate, and median of the server. Specifications: Material: Plastic Size: approx. 3.45x1.65x4.9cm/1.36x0.65x1.93inch Input: DC4.8-6V Package Includes: 1 Piece Servo Tester note: This servo tester cannot test servo weighing less than 55g! Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.