With the battery operated device tester st 710 mobile simple and economical tests can be done on electrical devices resources such as electrical equipmenttools with onoff switch heating devices motor devices lamps cord reels multiple distributors and household appliances in accordance with din vde 0701 0702 bgv a3 ve norm e 8701 nen 3140 the ground wirecontact current is measured with the leakage current methodperformance characteristics easy operation via three keys fast