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My experience with Laser collimators indicates to me that cheap ones are a waste of time. Most of the cheaper ones can be rotated in the eyepiece holder to reveal the spots position changing on the primaries surface.This is due to poor alignment of the collimator in the focuser and /or poor alignment of the laser diode in the body of the collimator. The Hotech one mentioned above certainly makes an attempt to assure alignment in the focuser.The only way to test the collimators accuracy quickly would be to collimate with it , remove it and then replace it , if its accurate the spot should be where it was.So try before you buy might be the way to go.When i had a Schmidt Newtonian i collimated roughly with a hotech collimator and fine tuned using a cheshire eyepiece .
philip
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