API Pond, Master Pond Water Test Kit, Helps Monitor Water Quality & Prevent Invisible Water Problems That Can Be Harmful To Fish, Measures Ornamental Pond pH Balance, Ammonia Content, Nitrite Levels & Phosphate Content, Includes 6 Test Bottles, Instructions, 4 Glass Test Tubes With Cap & 2 Color Charts For 500+ Tests, Use Weekly For Monitoring & When Water Or Fish Problems Appear.