DistoX v1 holder for Leica Disto A3

This is a DistoX v1 holder. It can hold a Leica Disto A3 for calibrating its DistoX upgrade in combination with Mykyta Kozlov's calibration cube as announced on FB: https://www.facebook.com/groups/2205123638/permalink/10153870390228639/ and described here: https://bitbucket.org/ngry/distox2_cube/overview

(for non-initiated cavers, a DistoX is an upgrade for a Leica Disto designed by Beat Heeb to be used for surveying caves. You can find Beat's site about paperless cave surveying here: https:/