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The GSO laser collimator can be collimated itself (it has axis adjustment screws). Some laser collimators cannot be adjusted, better check with the supplier before you buy one. There is an Article in the Projects and Articles section on how to collimate your laser collimator - worth reading and doing.
It's pretty simple, just make a small jig to hold the collimation tube (can be as simple as four nails arranged in a criss-cross cradle in a a small board), and aim it at a target about 5 metres away and mark the spot on a target piece of paper then rotate the collimator tube about 90 degrees in the jig and mark again and so on as you turn it in a circle on the jig. If the spot doesn't wary much (say they are all in a 10-15mm circle) then consider it good enough. the smaller the grouping the better. If they are outside of that boundary you can adjust the laser with the screws on the unit and try again.
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