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How accurate is the Chrono Connect app ? I've been using it and if you take the time to get all of your measurements during setup set properly it seems to be pretty darn close. close enough I'd think. Shouldn't be any problem using it indoors as long as whatever you're shooting at makes some noise.
I think Caldwell is the best chronograph for the money...I bought one of these at MidwayUSA a couple years ago and it has worked flawlessly ever since. The lights are infrared and even have a battery pack so you can use the lights off battery power or plug them in the wall with the power cord provided! For $134.99 you can't beat this deal...it would cost about $300.00 for the ProChrono & accessories to equal what you get with the Caldwell, and the ProChrono does not come with a tripod or battery pack for the lights either.
I have two Chronys, a Shooting Crony Alpha and Beta and both work fine for me. Which ever your choose to go with you should count on getting some sort of light kit for it for indoor shooting assuming it doesnt already come with one.