I have a Burton Model 2021 with prism ring compensator for sale. It is in excellent condition, rarely used. We bought it new for our office and kept it only to use the prism compensator. $650 plus shipping and packing at UPS.

I also have an old A.O. lensometer Model # M603B. Great for a backup unit or for that extra set of eyes to check a job out. If I was setting up a lab or office on a shoe string, I wouldn't hesitate to use it. It is very accurate for checking, layout or duplicating. $250 plus shipping and packing.