This page is a part of continuing efforts to make the LightWave documentation complete. If a link takes you back to the main page, it leads to a page that hasn't yet been created. Let us know if you find one!
You need to select more than one point to use this tool and once you have and clicked on the tool you will receive the information shown in the window that appears. You will get a Straight Distance measurement, which highlights the longest straight distance between two points by selecting them while the window is open (the original selection will return when you leave the window). You also get the maximum X, Y and Z distance between points.