Testing equipment can be put to good use ensuring that electrical equipment is properly installed and safe to operate. Faulty installations can be lethal; the condition of electrical installations can be established when contractors use test equipment. Gardner Bender is pleased to offer an innovative full feature line of test equipment designed to make electrical work faster and safer. Use this Analog Battery Tester to test all common batteries to determine if they are charged or need replacement. Simply touch the red lead to the positive and the black lead to the negative on the battery. Tester will provide battery level reading. Easy to read color coded analog display.