Glad it was useful. I bought my first shot timer before my first smartphone, so I already had a good shot timer. If I'd had the smartphone first and been looking at another $130 for a dedicated shot timer, I might feel differently; but generally a dedicated shot timer will do better and catching shots and requires less fiddling to calibrate.
One thing you can do with the Surefire app, is sometimes you can calibrate it so it will work with dryfire if you have a DA pistol. That can be handy also.
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