For proper use, we recommend downloading the source format.The viewer version is intended only for use in the web viewer. In the Original format, the following are fully preserved:✔ original scene hierarchy✔ all materials without simplification✔ proper texture maps✔ proper object namingIf you plan to use this model in production, choose the original version.Mitutoyo Calipers. Top of ruler is mm bottom ruler is inches and the dial measures .001 . Modeled from a pair I inherited I believe this style is from the 90 s it s paperwork had it last calibrated in 94. Calipers can be opened by using the arrow empty which also turns the dial and adjustment wheel.