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Robert,
If you do want to build and use a small spectroscope...bite the bullet and buy a 200 l/mm transmission grating from Paton-Hawksley - you won't regret it.
The ebay gratings are for visual effects at the disco! not for science.
You can find some 60 prisms on ebay out of India... Surplus Shed also sell a selection of prisms which are OK. I got my first one down at the St Kilda Saturday market...
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