One of the most popular hand held battery load testers, the 6031 incorporates a diode test that diagnoses defective diodes including the GM trio test. 125 Amp load checks state of "battery health" on conventional and maintenance free batteries.
Associated 6031 Battery Alternator Tester
Associated alternator/Battery Tester model 6031
6044 ASSOCIATED EQUIP System Tester: Digital, 0 to 45V, 150 to 1000 C1
6044 ASSOCIATED EQUIP System Tester: Digital, 0 to 45V, 150 to 1000
Associated 610263 Battery Tester Switch Only for ASO6029
Associated Starter Circuit Tester #8540