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Sperry Instruments Voltage Testers When you are on a Jobsite, safety should be the number one priority. Electrical equipment is installed correctly and safe I have had my HET 202 for several years. It is the easiest, most sensitive meter I've ever used. I use it to test my electric fence at the ranch. Other testers SPERRY INSTRUMENTS 2-RANGE Voltage Tester Het202 110-220 V Ac/Dc. Used - $6.99. FOR SALE! USED SPERRY HET 202, VOLTAGE TESTER. VAC/DC 110/220. 234335688663.This instruction manual contains warnings and safety rules which must be observed by the user to ensure safe operation of the instrument and retain it in safe.