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Spectronic Educator Spectrophotometer As-is - $35 (NW Boulder)
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Spectrophotometers can be used to get a transmittance or absorption spectrum, determine phosphorus content, study photosynthesis, etc.
The spectral response looks good with respect to the peak locations (see comparison with didymium filter in photo, without calibration), but it's not reading 100% transmittance when no sample is present. That could be for any number of reasons. The bulb that's in there seems to be a GM replacement for the original with the same specs, but a different filament location. Also, I see a potential gap where stray light might be getting into the photodiode chamber. Could be a fun project. It's old enough technology to be repairable.
Includes pdf copies of the spec sheet, user's guider and educational manual.