Testing water is the single most important task an aquarist must perform in order to maintain a healthy, thriving aquarium. This kit makes it quick and easy! The Saltwater Master Kit includes: Ammonia, Nitrite, Nitrate, and High range pH. It has four vials to perform the tests, as well as instruction booklet to show how to perform the test, and what steps to take next. All of the test are colorimetric and can be read easily with the color chart included. All together this kit performs over 550 tests. It's up to you: pay to have someone test your water, or do it yourself with this kit and save time and money!