Made by Esterline Instrument Corp for Bio-Rad. Part Number 201CE. Unit consists of a Deuterium Lamp, Beam splitter, Lens that couples to sample chamber, (not included). and stepper motor driven mirror assembly which balances the sample output to the reference output and produces a measurable value. Unit includes power supply for lamp, stepper motor and pc board 9-1/2" X 14" with 3 plug-in daughter boards. Units are new in box with final test sheets. Connections for power, serial port hardware control, channel 1 and 2 analog outputs. 11-3/4"W X 9-1/2"H X 19"D, weight 32lbs. Believe the units were used to sample air quality. Operates on 100-240VAC 50/60Hz
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