Ok i can see the test kit in the link provided, basically i doubt if the testkit is very accurate i think its pretty useless TBH, with a KH of 1.1 degree i would expect to see a ph somewhere around 7, the testkit does not give accurate enough information for the ph, increments of .4 are to wide to be able to check co2 levels accuratly and the same goes for all of the other ranges as well KH GH etc they seem to go in increments of 50 which is way to much to be of any help.
You will have to buy seperate ph and KH testkits and these will be much more accurate, buy a ph kit thats gives the ph value in a minimum of .2 steps, i use an API ph kit and find it accurate, for KH i use a Nutrafin kit (this kit will also do your GH as well) i also find this kit quite accurate.
Im sorry but it may have been a waste of your money with the kit you bought off ebay personally i would say its no good at all and would be impossible to trust given the wide margins the kit is working from.