Simpler testers may give false positive readings. The Model 379 puts a full load on the battery. Provides accurate indications of the condition of all standard flashlight, hearing aid (mercury cells), transistor, computer and portable radio batteries. DC Voltage Ranges, 1.5 V/4.5 V/6 V/ 7.5 V/ 9 V/15 V/ 22.5 V/ 30 V/ 45 V/67.5V/90 V Load Resistance, Within 5% Includes Replaceable Tip Leads 379 Battery Tester, Catalog No. 12380