Brass dial head 40 mm dia with stainless steel screw 0.5
mm or 0.1 mm pitch, head divided in 100 divisions, reading
to .001 mm or .005 mm and registering on vertical scale 10-0-10
mm frame with feet of stainless steel on p.c.d. Of 46 mm.
Separation approx. 40 mm. Zero adjustment can be done by unscrewing