Trijicon does not provide an actual value as to what the adjustments within the digital reticle are. They offer a one shot zero option and that is how they recommend you zero the optic when using it.
Per my manual for the IR-Hunter Mk III, one whole number value = 1.26" @ 100 yds. On the Mk III there is a DRO (digital readout) to tell you the current X and Y values as 0.00. At native magnification, one "click" is one whole number. Zoom in to 2x and now one click will adjust the number by 0.50 (0.628" per the manual), 4x makes one click adjust the DRO by 0.25 (0.314" per the manual), and finally, at 8x, one click adjusts the DRO by 0.125 (one eighth) which is 0.157" per the manual. All adjustments listed @ 100 yds. I used mine for a month, successfully killing coyotes to protect my livestock, before I ever read the manual, even for sighting info. It's really pretty easy.