AMPROBE

ELECTRICAL RECORDING AND INDICATING INSTRUMENTS-NAMELY, VOLTMETERS, AMMETERS, VOLT-AMMETERS, STEP-UP AND STEP-DOWN DEVICES USABLE WITH VOLTAMMETERS, CIRCUIT TRACERS, VOLT AND AMPERAGE RECORDING INSTRUMENTS, NULLBALANCE MEASURING INSTRUMENTS, DEVICES FOR AMPLIFYING MEASURING INSTRUMENTS, OUTPUT AND AUTOMATIC INSTRUMENT CONTROLLING SWITCHES