Surface plate base includes column and clamp with fine adjustment.
Optional column sizes quoted upon request. Comparator Stand Form

Standard size 1" dia. x 10" high column, approx. 2 1/2'' throat
clearance measured from column to center line of indicator
stem.  Standard clamp accepts all lug back AGD indicators.

Special clamp with 1.365" dia. x 10" high column, approx.
4.75" throat clearance measured from colum to center line
of indicator stem.  Special clamp accepts stem drop
indicators. (indicators not included)