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These Direct Vision spectroscopes are fun and can be used visually (held behind an eyepiece) to show the spectra of the brighter stars.
They can be trashed to extract the Amici prism (and sometimes the slit) which can then be used to build a small astronomical spectroscope.
The prism gives a non linear dispersion which makes calibration a PITA.
I'd still save your money for a decent grating.
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