Aquarium Test Tube Holder Rack API Saltwater & Freshwater Master Test Kit Marine Test Tube Holder Rack for the API Freshwater Test Kit. This is just for the rack/base - TEST KIT NOT INCLUDED. The API Freshwater Master Test Kit is the gold standard for checking the water chemistry of your aquarium. But it comes in a really poor quality container that is impossible to use regularly. Using this design and a syringe, I am able to keep test time to under 2 minutes. This version is the "Master + Hardness" Kit: Holds 12 test bottles and 6 test tubes This version is the "Master + Hardness" Kit: Holds 12 test bottles and 6 test tubes Made from a durable plastic that is water & chemical resistant Each kit is clearly marked from left to right: PH, NH4+NO2, No3, GH, KH Free 30 Day Hassle-Free.
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