I made a mistake buying this, thinking it was all three of the items included in the picture. Be aware that this is ONLY for nitrates and includes one test tube with two solution bottles and necessary color cards/instructions. There are two different color cards (one for freshwater, one for saltwater). There are instructions in picture form on the back of the color cards, and they are plastic so they won't get water damaged which is nice.
Rating: [4 of 5 Stars!]