High precision-made tribrach(like No.59-K370sw). Instead ofthe commonly usedthree standardboltson this special modelonly two loose screwsare used.
Through this systemitspossibleonlyin aleveling ofheight.
Meaningfuluseonlywiththe pier head-end plate14A.
The pier panelshould beprovided with aclearly marked(eggrains), so that the tribrachcan bepreciselyalignedfor repeat measurementsin thesame position asthe reference measurement. A simple, inexpensiveand accurate solution.
