Harbor Freight is a knock off of this item:
http://www.ridgid.com/Tools/SeeSnake-micro/index.htm

Jim Brewer

Rigid offers a 9.5mm camera head for their unit - about 3/8" diameter.
30068 - about $100 from toolbarn.  And then you can get the Rigid
SeeSnake micro that looks compatible for about 81 from Pex Supply.

http://www.toolbarn.com/product/ridgid/30068/?ref=base

http://www.pexsupply.com/RIDGID-26663-Imager-Head-and-Cable-for-Seesnake-Camera-10370000-p


Matt-