![Dutch Hill Tribrach with Optical Plummet](http://e38surveysolutions.com/cdn/shop/products/trib-removebg-preview_{width}x.png?v=1593028075)
Dutch Hill Tribrach with Optical Plummet
This is an attachment plate used to attach a surveying instrument to a tripod. A tribrach allows the survey instrument to be repeatedly placed in the same position over a surveying marker point with sub-millimetre precision, by loosening and re-tightening a lock to adjust the instrument base in a horizontal plane.