Scale Levels

When using Optical Tooling scales, it is important to keep them horizontal or vertical, depending upon the orientation of your measurement.  It is easy to eliminate cosine error from your measurements with just a little care.  We have two different scale levels.  One fits our "narrow" scales (3" - 20" and 80 mm - 500 mm) and the other fits our "wide" scales (40" and 1000 mm).