This add-in helps you to measure the total length of selected ducts, pipes, cable trays and conduits. Mark elements and check their length. It's so easy!
This is an excellent little add-in.
Activate add, create yout selection, finish and you get a little pop-up showing the lengths.
There is one additional that would make it much more useful: adding centre lengths from duct/pipe fittings i.e. the centre line length including fittings.