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Geoff, anything is possible. You could home brew this unit, quite easily. Just as Phil suggested. My only reservation is that the pro version has some degree of certainty regarding dust not entering your scope. However, to the adventurous this could be a good little project. There is at least one step by step construction tut on CN for this very item.
For the rest of the lazy, this is for you. Besides like Tony said, this is cheap for our hobby.
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