Features: [Sound Guide Rail]: wear and comfortable, it transmits the information data to the meter. [Sliding Clips]: The dial can be held in place for measurement and the removable jaws can be adjusted to suit all dial sizes. [Indicator Light]: It is equipped with a red indicator light that illuminates and flashes when it is switched on. [Data Transfer Terminal]: Uploads data to a computer, highly accurate and easy to use, ready to use when connected to a computer. Compatible with tablets, laptops and desktop computers with the system. [Multi-functional Design]: Supports signal value, daily rate, polarisation, oscillation, frequency, watch tone waveform display; and supports frequency setting and ascending angle setting. This calibrator is an instrument used to calibrate mechanical watches. It measures the time accuracy and error of a mechanical watch and performs calibration to the accuracy and stability of the mechanical watch. It is one of the essential tools for watchmakers, watch repairers and watch collectors. Material: plastic colour: grey Package Contents: 1 x Watch Calibrator 1 x data cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.