For a newt the catseye kit with cheshire and auto collimator I find is the best thing. Lasers have their place too. If you apply the laser and it's not square in the focuser then you will miscollimate your scope. Some newt you can't collimate with a cheshire unfortunately. So there's a variety of tools to do the job. In the end the hardest thing is about using them consistently the right way so you can have repeatability in your measurements. I also highly recommend pattern lasers such as howie glatters attachements.
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