Simply put having a test kit is essential for any reef aquarium keeper. I only have a 28-gallon tall aquarium with just soft corals, a feather duster, a few damsels & a couple of cleaner shrimp. The API Reef Master Kit is well packaged and everything is labeled very clearly. I sometimes have difficulty interpreting the nitrate and phosphate tests as the results are limited to viewing color code charts of different shades of green and orange. For example when I conduct the test for nitrates, my resulting shade of green from my test tube is in the range of .50 to 1.0 as my best guess instead of .50 or 1.0.The instructions are very well written and easy to follow although I can't help, but notice API's intentional attempt at product placement by their brand. For example if your test kit yields a high result for phosphates, the instructions recommends that you purchase & use API's Phos-Zorb to help reduce phosphates in addition to conducting water changes & removing waste. If you have low calcium levels you can use API's Eco Calcium Marine to increase calcium levels. If your nitrates are high you can use API Tap Water Filter to help reduce nitrates in addition to water changes & the removal of waste.Some other reviewers have complained about the absence of the ammonia test, but I have already owned API's ammonia test kit (with its different shades of yellow test results chart) that I used when I initially cycled my aquarium, so adding the reef master kit just supplemented to what I already have. Didn't need the instructions help to buy another API product for ammonia testing because I already did.Overall an adequate test kit for the very important task of truly knowing what's in your aquarium water (or at least ballpark figure ranges) to help your corals, fish & invertebrates thrive successfully.

I have been using this a lot because my aquarium gives me fits. It seems to work well. Everyone suggests more expensive test kits but I don't see why. this one works fine for me.

I'm sure there's many test kits out on the market. This bare bones tester does fine and measures everything I want it to measure.

There's nothing wrong with the kit, it's just that we also had to purchase an ammonia and PH testers as it didn't include these. So I found this misleading and didn't clue in to this omission. Everything works fine, the same as any other liquid test kits. If there was a more complete one out there, I would recommend that one instead.

When combined with the Saltwater Master Test Kit, these kits provide all the tests that a beginning reef master could want. I am using these tests in a 40 gallon breeder reef tank, and so far they have been easy to use and reliable. The only complaint I have is that they are sometimes hard to read on certain tests. It is hard to decipher the different levels from one another if they are close.Still, I would definitely recommend this kit to anyone that has a reef tank.

Products received in condition listed on a timely manor. I would recommend doing business with this seller.