I've purchased other of the API line of test kits, this is a fairly simple one compared to some of the others. Rinse and fill the testtube to the line, add the drops and cap, invert several times and read by comparing to the chart. Drawback is the test tube is thin glass, and tippy prone despite having a flat bottom, and that style of cap doesn't always want to fit fluid tight. Though the ease of performing this test is very nice.
Rating:
[5 of 5 Stars!]