Cant get it to download properly!

Purchased the chronograph that this app is intended for and tried downloading the app and it just shows up a dark icon as if its still downloading or waiting to be. I tried to delete it and it wont come off my phone. Try to download it again and it just says "open" in the App Store as if it is downloaded. But when you hit open it does nothing! Very Disappointed to have paid that much money for the chronograph and cant get the app to work!

Roughneck419 about Caldwell Precision Chronograph, v1.18