Check the listing for details. 2 Pack Battery Tester, Universal Battery Checker for AA / AAA / C / D / 9V. Condition: New. Listed at 7.96 USD. The 2 Pack Battery Tester is a universal battery checker designed for use with AA, AAA, C, D, and 9V batteries. This product is essential for testing the health of your batteries to ensure they are functioning properly and providing the power needed for your devices. With this convenient 2 pack, you can easily check the battery levels of all your devices at once, making it a must-have for anyone looking to maintain the performance of their electronics.The 2 Pack Battery Tester is a universal battery checker designed for use with AA, AAA, C, D, and 9V batteries. This product is essential for testing the health of your batteries to ensure they are functioning properly and providing the power needed for your devices. With this convenient 2 pack, you can easily check the battery levels of all your devices at once, making it a must-have for anyone looking to maintain the performance of their electronics.