***Direct from the Manufacturer - USA*** The WaterWorks School Test Kit #487995 CONTAINS ENOUGH MATERIALS FOR A CLASSROOM OF 30 STUDENTS: 30 COLOR CHART CARDS, 30 PIPETTES, 30 VIALS, 1 ACTIVITY CD-ROM, AND 60 TESTS EACH OF: NITRATE NITROGEN, NITRITE NITROGEN, TOTAL ALKALINITY, TOTAL HARDNESS, TOTAL CHLORINE, FREE CHLORINE, COPPER, IRON, PH. WaterWorks School Test Kit is perfect for classroom science experiments. Designed for a classroom of 30 students (a total of 540 tests in each kit), the WaterWorks School Test Kit contains 11 educational classroom activities & experiments including creating water cycles and testing for acid rain. There are no chemicals to mix, and no glassware needed so every test is safe and easy to run. This kit also tests for Nitrates, Nitrites, Total Hardness, Total Alkalinity, Total Chlorine, Free Chlorine, Copper, Iron, & pH and comes with an easy to follow activity booklet. This product DOES NOT require an eXact photometer to read results.