GENERAL RADIO COMPANY 1551-C SOUND LEVEL METER w/ 1560-P5 MICROPHONE

GENERAL RADIO COMPANY 1551-B SOUND LEVEL METER no power supply

General Radio 1551-C Sound Level Meter with 1971-9605 Mic and Case - Lab Tested

General Radio 1551-C Sound Level Meter with 1560-P5 Mic and Case

GR-1551C Sound Level Meter READ

General Radio Company Output Power Meter 1840-A

Vintage General Radio Company Type 1230-A

General Radio 1538-A STROBOTAC Stroboscope General Radio Company Untested As Is