Vintage Jones Model 1600-2 Hand Tachometer Single Range Stop Button Case

Antique Dr. Horn's Foxboro Co. Portable Tachometer In Case With Attachments

Vintage Diffusion Systems Portable Photoelectric Photometer, Lux Meter

Jones Single Range Hand Portable Tachometer Model 1600-7

Vintage Dr. Horn's System Foxboro Co. Portable Tachometer, Case, Attachment

Vintage Metron Hand Tachometer Model 26A Metron Instruments In Case

Jones Portable Instrument Corporation Tachometor W/stop Feacher Model 1600-4

Vintage JONES 5101-131 TACH Tachometer Hundreds