4 pieces of a red Tektronix "CAL" knob with yellow band at base Used on a equipment including oscilloscopes and plug-ins Fits a 1/8" shaft Has one hex set screw
This is a System Sensor 2W-B 2-wire plug in photoelectric with base. 12/24 Volt. Features include: photoelectric smoke detector with plug-in design allowing pr-wiring before installation.
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