These kits allow your students to check water quality using safe, simple and effective tablet-type tests. Students will perform ammonia, chlorine, dissolved oxygen, nitrate, phosphate and pH tests. Kits also include detailed background sections on types of water pollution, sources and effects of each factor tested, color comparison charts, reproducible student handouts and a complete teacher�s guide with valuable teaching tips, answers and further extensions. Single Class Kits include enough materials for 30 students working in pairs. Five-Class Kits (Super Value Kits) are complete for 5 classes of 30 students working in pairs. Replacement sets of color comparison charts are available. Individual Kits contain a color comparison chart, detailed instructions, sample tube and enough tablets for 15 tests.