This German-made prism assembly replaces hand-held methods of coordinating track control marks

It is widely used in Europe for accurate railway surveys including traverse and resections.

The anodised aluminium & stainless steel body attaches to 12mm TCM brass bolts.

The prism can be rotated in two axes and levelled with the built-in bubble.

Prism diameter: 38mm, Leica zero constant. Height of prism 100mm above bolt.