Why not count your sticks of pipe X 10', deduct scrap and multiply times the conductors = pretty accurate. Add some for in the box, or just for fun factor.

The model shown on that link is also for conductors 1"-2" diameter.

They have other smaller versions, may be cheaper. http://www.wemco-usa.com/45.html

Mark Heller
"Well - I oughta....." -Jackie Gleason