The sulfate test included with the LaMotte BrewLab has a comparator in it for measuring the turbidity of your water sample after adding the reagent. It ranges from 0-200ppm, but at very low and very high levels it can be difficult to discern. At over 20ppm and below 200ppm though it is very effective.
There are no chloride test strips in the kit, there is a chlorine test strip. It does range from 0-10ppm and is used simply to insure that all of the chlorine is removed from the water before beginning.
The digital pH pen is a very good model for the price range. There are many digital meters available at even higher costs that arent nearly as good. LaMotte does carry more advanced pH meters, but they can sometimes be a bit pricy.
To include a chloride or sodium test in this kit would have greatly increased the price, and these test can be a bit involved compared to the others, so it was decided not to put it in this kit. LaMotte does have tests available for these which are sold separately.
This kit is designed to test your water before you begin to brew and cannot test samples after the process has begun. Most of the tests are based on color changes and so will not be effective after you start brewing. The exception to this is the digital pH pen. It can be used throughout the brewing process and with proper care and maintenance should remain accurate for a long time.
Although not everything that you may want to test for is included in this kit we feel it is the most comprehensive collection aimed at the home brewer available to date. The precision and accuracy of the tests are better then anything you could purchase from a pool supply or aquarium store. I know because we make many of those types of kits also. We have been in business since 1919 and have bought that experience to bear while creating this kit.
We are always looking for feedback, and adjustments to the BrewLab may be made in relation to any information we receive from end users.