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The Associated 6039 provides complete testing for 6 and 12 volt systems in a small package. Simple tests include a State of charge test, Battery load test, Starter test and Charging System test. Easy to read digital voltmeter and ammeter combine with the versatility of a carbon pile load to give quick and precise determination of battery and charging system problems. Spring loaded load knob shuts off automatically. This 0 to 600 Amp 0-19.99 volts DC tester has unique curved discs to prevent hot spots. Heavy duty clamps with "Flexi- Spring" cable guards provide added value.