The Ballistic Chronograph app is for use with the Caldwell line of Ballistic Chronographs supporting a 3.5mm (TRRS) line-out serial port.

For best performance - make sure your device is up to date with the latest software updates provided by your manufacturer and/or carrier.


If you are unable to connect your Android device to the chronometer follow these instructions:



With the audio cable disconnected at both ends…


1. Connect the audio cable to the Android device

2. Connect the audio cable to the Chronometer

Chrono USB Support (v. 1.24+)

NOTE: Not all devices support USB. To test if your device has USB support - download and run USB Host Diagnostics by Chainfire from Google Play.

A USB 2.0 A-Male to B-Male Cable + a USB On-The-Go Connector is required. These cables can be purchased through Amazon.com Radio Shack and other retailers.

When prompted to Allow the app Chronograph to access the USB device - Select OK.

If you do not see a prompt - check your connection and try again.

If you are unable to connect the device - Please ensure your device has USB support.