Jewell Electrical Instruments Millivolts Meter MM3

MICROAMPERES Wood box/ Bakelite Meter Jewell Electrical Instruments

HANNA INSTRUMENTS HI 8519 N MICROPROCESSOR pH/mV BENCH METER + EXTRAS

Jewell Direct Current MILLIAMPERES METER, 0-300, Pattern 88, 1912 Vintage

Vintage Jewell Electrical Instrument Pattern Gauge No. 135 Meter Untested

Amperage Meter - Westow Electric Instruments