The Pondwater Tour Grades 4 - 8/ 50 students in groups Study and measure changes in water quality in a lake, pond or aquarium using safe reagent tablets. Determine natural processes and variables that affect water quality over time. Includes: test bags; test tubes with caps; color poster; TesTabs? (single-packed in foil) of the following: 30 each ammonia #1 and #2; 60 dissolved oxygen; 30 each nitrate #1 and #2; 10 Nutritab; instruction manual. Qty :