The kit I have, from Leslie's, looks equivalent to the listing for the K2006 as illustrated in Amazon, with the exception of cyanuric acid. I have a separate test kit for that. The Leslie's kit allows me to measure pH and acid demand, total hardness/alkalinity, and, of course chlorine levels. My kit uses two tiny tubes with colored patches corresponding to chlorine levels and pH.

This is not very precise; a better way would be to use a proper indicator and count the number of drops and then convert to chlorine or pH. As I remember my qualitative and quantitative analysis college chemistry courses many years ago this would be "easy" for pH; I have no ready idea what indicator would work for chlorine.

I'm not sure that I stated my question accurately. If I dilute the pool water with an equal amount of distilled water (to avoid any domestic supply chlorine) and then test for chlorine levels, wouldn't the indicated levels with the test kit represent 1/2 of the chlorine levels of the undiluted sample? So an indicated 5ppm via the kit would actually be 10ppm?