Designed specifically to test zinc air hearing aid batteries.
Digital Battery Tester With Built-In Battery Compartment.

• Checks all types of hearing aid button cells.
• Convenient to carry in pocket or purse.
• The tester will indicate if the battery is good or bad.
• Incorporates the latest digital technology.
• A convenient built-in sliding battery case stores two 675 type cells (or smaller).
• Uses only 0.3mA for each test