Oh, a couple other things:
I personally wouldn't spend $18 on one. Harbor Freight has them for less and so does RadioShack and most Dollar Stores/Big Lots
Here's one at RS for ~$8 (and they have others as well)
You'll probably want a smaller tip than what appears to be in the Sears photo. I guess that's a YMMV statement, but I've found it to be true for me.