If you can afford it, get the Oehler 35P. You will never look back or wish you had bought something else. I have owned four different chronographs and the Oehler is the best by far. All the others were finicky. The Oehler never misses a shot unless a shadow is on only part of one of the diffusers. Now that I know that, I watch for it. It is also simple to setup and use.

Mike

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NRA Certified Pistol Inst.