All are manufactured to pharmaceutical standards to ensure they contain the exact amount of reagent every time, for accurate readings. Each individual test table is foil sealed for freshness and has a long shelf life, with the 'best before' dates clearly marked on the packaging. They are simple and easy-to-use with each kit including a safety plastic test tube with a secure lid and tablet crusher to aid the mixing of reagents. Every kit also comes with a comprehensive guide on how to use it and important information on the results of the tests and how to resolve any problems that may have arisen. The Ammonia table test kit is suitable for use with all freshwater and marine aquariums.