Vertex III-60, fasten the T3 transponder to the tree at any height, walk a distance of your choice and measure up to six different heights on the tree. With the new “Reverse Prism” function you are able to use the Vertex III on prism cruises as well. By selecting one of the built in BAF’s you are able to be at the tree and determine its minimum diameter to be included in the point. This function allows you the ability to Prism cruise on tracks with thick underbrush that you could not do with a standard prism.
