Available in a number of configurations whose working heights range from a minimum of 67” (1.7 m) to as high as 112”(2.84 m). Height is measured from the floor to the top of the intermediate tube. Also available in a hollow version. Supports all types of metrology instrumentation. Mobility around the shop floor is permitted using the drop-down casters under the heavy-duty tribrach base which are engaged and released by a hand wheel crank mechanism. An air-check mechanism provides backup protection to prevent sudden “falls” of the instrument column.