Opto Sigma's GOHT-B are stacked 2-axis goniometers with intersecting, orthogonal axes of rotation. They are the first and only goniometer to feature curved EXC™ precision bearing ways which are processed directly into the body and base, resulting in the highest stiffness, load capacity and smoothness of any stage on the market. This patented bearing technology also provides the GOHT-B with nearly friction free high-resolution movement as well as rotation axis displacement that is 1/10th the magnitude of dovetail bearing goniometer displacement. This family of GOHT stages are lead screw driven and include a vernier scale which allows angular readings to 0.10 degree. All include locks, are made entirely from hardened tool steel, and are plated with an RoHS-Compliant black chrome.