Features: It can be used to measure the button battery of the watch. Also can be used to test watch quartz movement, high efficiency to operate. Demagnetizer with built-in switch button to demagnetize your mechanical watches. Made with sturdy and durable plastic and metal, having long service life. Lightweight and compact, very convenient to carry and storage. Specification: Condition: 100% Brand New Material: Plastic, Metal Size: Approx. 10.8 x 8 x 3.1cm / 4.3 x 3.1 x 1.2in Battery: 2 x AA (not included) Package List: 1 x Tester Package List 1It can be used to measure the button battery of the watch. 2Also can be used to test watch quartz movement, high efficiency to operate. 3Demagnetizer with built-in switch button to demagnetize your mechanical watches. 4Made with sturdy and durable plastic and metal, having long service life. 5Lightweight and compact, very convenient to carry and storage.