I have a genuine Sino DRO that was removed from milling machine when converted to cnc. Works great, comes with all of the original hardware and mounting parts, plus some extra from a different dro kit. Resolution : 5µm (0.005mm/0.0002) 2 scales are sino mk-300 which measure 26.75” and 22.75” The 3rd read head is a sino ka-300 which measures 14.75”. I believe the travel is about 4” less than these measurements. Works great, and these can be shortened pretty easily if you wanted, I can show you how.