Features: The Hearing Help Battery Tester combines a tester and storage function, featuring a build in battery compartment that holds 2 to 3 batteries, ensuring precise measurement of hearing Help battery levels for models like 10/13/312/675. Lightweight and portable, this device is easy to use, for various battery types, offers clear display, and is energy efficient and environmentally friendly. Ideal for hearing Help users and their family , especially elderly individuals who need to frequently change batteries. Perfect for each time to check battery power any time , ensuring continuous operation of hearing aids during travel or outings. This essential tool enhances the reliability of your hearing aids by providing accurate battery position , making it a must get accessory for maintaining best hearing Performances. Specifications: Material: plastic Length: about 64mm/3inch Bottom: about 29mm/1in Height: about 13.7mm/0.5inch Package Includes: 1xHearing Help Battery Tester note: Please allow 1 to 3cm error due to manual measurement, please make sure you do not mind before you bid, Due to the differences between different monitors, the picture may not reflect the actual colorful of the item.