QTY. 1. GENERAL RADIO

QTY. 1. GENERAL RADIO 1531-AB STROBOTAC ELECTRONIC STOBOSCOPE 105-125V 50-60Hz 210-250 VOLTS 35 VA RPM SETTINGS: HIGH CAL: 3600/3000/24000. LOW CAL: 900/750/6000. AN INSTRUMENT FOR STUDYING PERIODIC MOTION OR DETERMINING SPEEDS OF ROTATION BY SHINING A MOMENTARY BRIGHT LIGHT AT INTERVALS SO THAT A MOVING OBJECT APPEARS STATIONARY.