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

Vintage General Radio Company Decibels Sound Level Meter Type 1565-A With Case

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

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

GenRad General Radio 1565-A Sound Level Meter w/ Leather Case – Untested Vintage

General Radio Permissible Sound Level Calibrator

General Radio Co Type 1551-B Sound-Level Meter

GENERAL RADIO COMPANY 1551-C SOUND-LEVEL METER IN MINT CONDITION