Basically, I am very satisfied with the JBL tests. However, missing from my perspective some important tests. Since especially the GH assay and a more accurate pH test mentioned. pH 3-10 is not really useful and are only an approximation to. Must have me therefore buy 3 additional tests (pH 6.0 to 7.6 in there heck yea be in most cases, GH Test and PO4). Now I'm only times sufficiently equipped but also not far from the price of the large test sets. Resume: The tests are absolutely but just not fully represented in order in the set and you need only buy additional tests, if one wants to take seriously the measurement again.