A Spec 20 spectrometer measures the amount of visible light absorbed by a colored solution. Move your cursor over the image for information about the instrument.
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Setting Up the Spectrometer Check that the instrument is turned on. The left-hand knob should be turned clockwise. Allow 10 minutes for warming up. Set the wavelength to the desired value using the knob on the top. T. Use the mirror behind the needle to avoid parallax error.