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There's a reason the tests included in this are "special" and not commonly included in marine test kits. Several require mixing re-agents at the time of test with short shelf-lives and others require taking immediate reading where levels become quickly inaccurate.
This test kit does the job but it's not easy to use. However, if you are dosing Iodide or need to measure other reef fundamentals its a life saver.
Great test kit and it does exactly what it suppose to however, it is a little harder to use that some of the other kit. It also is a little harder to read. overall i am happy witht he product but wish it was simplier