Looks like a Chinese cheap OTO phenol red kit with alkalinity testing and acid / base demand.

The most important tests, in order, are:

#1 - Accurate chlorine tests over the whole range
#2 - pH
#3 - Stabilizer

#4 & #5 are calcium & alkalinity tests, which are important on pools with heaters and concrete pools, less so on other pools.

Acid & base demand tests are included, partly as a hold-over from the post, when chlorine gas treated pools could end up needed LARGE adjustments in pH value, and partly because they are very cheap to include.

So, for 2x the cost of a $6 Wally-world special, you get a kit in a bigger box that does the 2 tests in the Wally-world kit -- which you need -- plus 1 test (alk) you might need plus 2 tests (acid/base demand) that you don't need. And then you have shipping costs and lack of a "return if broken" option.

So, I guess it's an OK option, but it's certainly not a good deal. I'd recommend that you stick with the Wally-world versions, till it's practical to get a Taylor K2006 (nothing against the LaMotte FAS-DPD . . . but it costs more than 2x as much).

Ben