Greiner Electronic Quartz Timer II Precision Timing Instrume...

Greiner Electronic Quartz Timer II Precision Timing Instrument, with instruction manual and acoustic pick-up microphone ** A Swiss made bench-top electronic timing instrument manufactured by Greiner Electronic Ltd., Langenthal, for precision horological measurement and calibration applications. Designed for the testing and evaluation of electronic timepieces, including quartz and tuning fork movements, the instrument provided an accurate reference for measuring the performance and rate stability of modern watch movements ** From the David Read Collection

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