Found this on another board :
If you want one grab this before they figure it out
Some folks may incur sale tax
free tds meter
Just came across this ... Thought some of you folks might like to try it out as it is free .
buy dot com offers a hand held TDS
meter which has a MSRP of $39.95 with a web discount of -29.95 ($10!) shipped free!
-> Then if you select the "google checkout" option, you get $10 off on orders of $10 or more! (so it's FREE!)
Be sure to select the slowest 7-14 day "free" shipping on the last page unless you want to pay for the extra cost. Also click on the pic of the credit card type below the cc number you enter or it will tell you you entered an invalid credit card. IT will give you some greif but will work
Now lets just see if we get ours