Correct but not great. Given for +/- 0.03mm, Compared with a Easson glass scale I got a +0.05/-0.04mm cyclical error with a 5+5 band (same vendor). Don't know if it comes from magnetic band or sensor. Otherwise packing a shipping were great.
All good, sensor shipped with RS422, easy fix to TTL, suitable for cheap DRO units. Good customer support. Anytime again.