Beta has one, but I'd never recommend that unit. I think Zumbach has a unit they call the LADAC, but I haven't used one in a long time.
Honestly, the Laser units were all more of a pain then they seemed to be worth, and very annoying to keep set up properly.
How about a regular capstan type counter?
http://www.taymer.com/html/wire___cable_length_measuremen.html
Like $30,000 expensive.
Can you do it by weight?