I’m in need of slip-meter advice

I’m trying to gain higher-end bids for my contracting company and have recently been doing a lot of floor work. I think that purchasing a slip-meter to have on hand to show customers the coefficient of friction on their floors before and after would be a good idea. Can anyone offer me a starting point of where to get a quality device and about how much I should be expecting to spend?
Thanks!

 

I bought some stuff to make my tile non-slip around 2009 and the company that I used sells a slip meter. Their stuff worked like they said, so I'm willing to recommend them again. This is the site address to it: http://www.slipperytile.com/american-slip-meter

 

That’s great! Thanks a lot bighill. I’m glad it isn’t any more expensive than that, otherwise I would have to hold off a bit before purchasing it!