Here is a link...
http://www.harborfreight.com/compact-ai ... 96997.html
The second is larger and heavier. It It also costs more than twice as much but as the saying goes you get what you pay for. While the smaller unit works well the larger scaler works noticeably faster.
Here is that link...
http://www.harborfreight.com/air-needle ... -1108.html
A really big plus with these things is they do not fling material everywhere. It just scrapes it off and nothing is lifted into the air, your hair or eyes.

Bottom line, I'd say these are worth having.

These shots show a quick use of both tools.
The larger scaler... you couldn't read this before and it only took a minute.

Now the smaller scaler...

