Item Type: Timegrapher Material: Plastic Voltage: 100-240V Purpose: To detect the movement speed, swing speed, and gear swing amplitude of the mechanical watch movement Package List 1 x Plug Wire 1 x Display Screen 1 x Timegrapher 1 x Manual 1Suitable for almost all mechanical watches and can work on coaxial watches, which is very convenient and practical. 2Large LCD screen, better field of view, clearer reading of data, easier to operate, and improved efficiency. 3Multi purpose watch detector is very popular among professional watchmakers and watch collectors. 4Can accurately calibrate the watch time and make your watch time more accurate. 5Save time, no longer need to go to the watch shop to repair the watch, you can proofread the watch time at home.