Batteries Tester for AA / AAA / C / D / N / 9-Volt for $2.99 shipped. Here is a screenshot for your reference. Note that it might take a while to receive this item. This comes in pretty handy when there is a pile of mixed old and new batteries. For your amusement, getting 5 individual testers works out to be a better deal than getting the 5-pack as shown here.