This kit is ideal for the professional aquarist and for in-store testing of tap water and aquarium water. Comes complete with reagents to test for pH (6.0 to 7.6), High Range pH (7.4 to 8.8), Ammonia, Nitrite, Nitrate, GH (General Hardness) and KH (Carbonate Hardness). Includes 6 glass test tubes with caps, computer calibrated color cards for each test, laminated 17" x 11" liquid test kit color chart with complete instructions, and a water analysis pad for recording results. Housed in a sturdy, waterproof box.