General Radio Permissible Sound Level Calibrator

GENERAL RADIO SOUND LEVEL CALIBRATOR 1562-A Unknown Condition

Vintage General Radio Company Sound Level Meter Type 1565-B (TESTED WORKING)

General Radio Sound-Level Calibrator Type 1562-A w/ Case (Parts, UNTESTED)

GENERAL RADIO 1552-B SOUND LEVEL CALIBRATOR, NEW OLD STOCK!

General Radio Company Sound Level Calibrator Type 1567 Instruction Manual 1972

NOS Vintage General Radio Sound-Level Calibrator 1552-B with Original Box

General Radio 1562-A Sound Level Calibrator w/ Case – Works – GR SPL Alternate