Leslie's also sells a salt test kit on-line made by Taylor. It uses the std test tube and includes R-0630 (chromate indicator) and R-0718 (Silver Nitrate Reagent).

I just tried it for the first time just now as I'm using 80lb bags of softener salt to weigh down my drop-in steps. The water tested at 1000ppm and the kit worked EXACTLY as described.

Not that I care about salt as I don't have an SWG, but I wanted to play with the new toy!