Caldwell Ballistic Precision Chronograph G2 Caldwell Ballistic Precision Chronograph G2 The G2 literally flips conventional Chronograph technology upside down. By inverting the system the G2 is capable of measuring in adverse light conditions making the measurements more accurate than conventional chronographs, even indoors. The light sensors were spaced 18" apart for … [Read more...] about Caldwell Ballistic Precision Chronograph G2