Caldwell Ballistic Chronograph

AOB Products Company

About this app

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.

Ratings and reviews

Now that I have it working, I like it. I read most every review and the app instructions to figure out what I needed to do. I tried it with a USB C to Audio adapter and that didn't work. I have a Galaxy S10 plus and here is how I got it to work. Trimmed the rubber off one of the plugs so the plug would fully insert and make connection into my audio jack. Enabled all permissions to the Caldwell App in phone settings. I first had microphone and storage enabled and it didn't work. I read in one review where someone had to enable all four for it to work. Start the app, plug in both ends of the cable and then turn the Chronograph on. Then give the app permission to connect. Now it works flawlessly. Hope this helps and good luck.

so far used for a little over a year it works well. nice to be able store saved groups with all the notes and even a picture of the group. the measuring portion isn't accurate all the time, and it would be nice to be able to edit weather conditions, which it won't allow me to do. all in all the app does what it should plus a little more

It's a simple yet functional app to go with a simple yet functional chronograph. It took me a while to get my galaxy 6 to sync with the chronograph. The instructions are are a bot misleading, stating that iOS users need to enable the microphone permission but that other phones should be fine. When I couldn't get things to sync I enabled the microphone permission and it syncs fine now. The app does everything that I need and even a bit more when the "show more" feature is enabled.

What’s new

Version 1.50 contains the following changes/updates:
• Additional Fixes for Android 14+ support.