Electric meters; Electric testers, namely, circuit testers, electrical outlet tester; magnetic meters and testers, namely, magnetometers; recorders for measurement, namely, electronic data recorders; [ digital recorders, namely, digital video recorders; ] data processing equipments, namely, data processors, computers, data processing equipment; data processing equipments for measurement, namely, data processors, computers, data processing equipment; oscillographs; pen-writing oscillographs [ ...