Brand: La Crosse Technology. MPN: 911-65557-INT. Don’t throw away good batteries — test them first! This La Crosse Technology Portable Digital Battery Tester is small compact and robust. Use it to quickly check batteries and rechargeable batteries 1 at a time in its slide-out compartment or side contacts for 9-volt. This battery tester is suitable for the most common battery sizes (AAA AA C and D) 3.0-volt button cells and 9-volt block batteries. Since the device displays the charge status and the battery voltage in volts you can quickly and easily check whether the battery still has enough power or needs to be replaced. And its small size means you can easily carry it in your purse camera bag backpack or luggage.