Spectroscope large Prism with scale

Reading-a spectrum has to be one of the most-frustating things, you have to get the light just right then you have to keep your hand and stone steady while you try to look out of the "corner" of your eye, while keeping boh eyes open!!! OMG.. Well this spectroscope makes that alittle-easier, it has:
an adjustible slit, this allows you to control the amount of light
sliding focus tube, so you can focus on different areas of the spectrum
Lighted-Scale allows you to be more accurate in the description of your spectrum
The scale has a sliding-focus
Calibration knob, that allows you to move the scale to the correct possition to ensure getting the most accurate-reading.

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