Universal Battery Tester (AA, AAA, C, D, 9V, Laser Types), Factory Sealed This universal battery tester can be used to test your AA, AAA, C, D, 9V, and cell button batteries You can save money, no more guessing, whether your batteries are dead or still have energy Don"t throw them away, test first Our product is compatible with: Alkaline, Lithium, and rechargeable NiCad, Ni-MH Compact size and light weight, high quality well built testing device This is ideal for electricians, technicians, owners of MP3, CD players, portable TVs, boom boxes, laser pointers, etc. It"s quick and easy to use with large meter If it shows red replace your battery If it shows yellow then its low power If it shows green then its good