German-made prism assembly attaches to Ø12mm TCM brass bolts and Ø12mm stainless pins.

Replaces hand-held methods of coordinating track control marks.

Widely used in Europe for accurate railway surveys including traverse and resections.

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

Anodised aluminium & stainless steel body.

Prism diameter: 38mm. Centre of prism 100mm above bolt.

Prism constant: -34.4mm (absolute),  0 mm (Leica).