1,Lithium Battery Silver Oxide Battery Tester: A device for testing button batteries applied in watches, calculators and other small electronic devices. It helps the user to quickly check the battery capacity and performance so that the battery can be replaced or the device repaired in a timely manner. 2,Demagnetiser: By using an alternating power supply to generate an alternating magnetic field, it can effectively eliminate time errors in a watch that are caused by magnetic field interference. The use of a mechanical watch aggregator can help a watch demagnetiser to demagnetise more effectively, thus extending the service life of the watch. 3,Movement Testing: Accurately monitoring the operations and performance of the quartz movement, discovering any potential problems and abnormalities in a timely manner, and taking appropriate measures to repair them can help ensure the accuracy and stability of the watch. 4,Multifunction Tester: Specially designed for testing and analysing multifunctional quartz watches with the function of introducing a tester. With a variety of testing functions, it can test the watch time accuracy, function operations and many other aspects. 5,Material: Made of ABS and metal, it has great abrasion and impact resistance, which can effectively protect the device from external damage, and can increase the overall stability and life of the product. Item Type: QD‑20 Quartz Watch Movement Tester Material: ABS, Metal Battery: AA Battery x 2(not included) 1 x QD‑20 Quartz Watch Movement Tester 1 x Test Line