Improvements in comparison to the current models include:

The Reflectorless measurement Range has been extended to 270m
Initial measurement time to prism / reflector sheet reduced by 40% in Quick Mode setting
EDM accuracy is now ± ( 2+2 ppm ) on all models except R-326EX
± ( 3+2 ppm ) on R-326EX
A date clock has been incorporated in all non prism models in addition to 2" and 3" prism models.
Reflectorless measurement capability of 270m with a visible dot professional laser pointer ( R-322NX / R-323NX / R-325NX / R-315NX )