PTI Photon Technology International OC-4000 Optical Chopper

Sitec Instruments Optical Chopper Controller

Racal Dana 9008 Modulation Meter *Fully Tested, but Needs Calibration*

Huntron Tracker 2000 Circuit Analyzer (cap Restore Kit Only) high quality caps

Racal Dana 9008 Modulation Meter *Fully Tested, but Needs Calibration*

Antique Leeds & Northrup No. 5410 Type T Portable Testing Set; USA; Untested

Leeds & Northrup 191057 Voltgun Calibrator - Untested

New Focus 3501 Optical Chopper