I do not believe it is worth it to have both a 2" and a 1.25" laser collimators. Just select one of the two depending of your EP usage. If you use 1.25" EPs more then get a 1.25" laser collimator and vice versa. If you are still undecided, just flip a coin. You can't go wrong with either but do ensure that you get a quality laser collimator. I have a Glatter which is the best commercially available laser collimator.
Jason
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