Great for field trips and experiments! All tests are easy to perform and provide professional results. The apparatus and materials necessary for performing each test several times are provided. Refill includes: Phosphate color change card, dissolved oxygen I, dissolved oxygen II, dissolved oxygen III, sodium thiosulfate, PI Phosver powder, Choride, 2 Powder, Universal 3 hardness reagent, tritaver titrant edta, silver nitrate 12-1/2 x 6” x 2-1/2”.
Refills also available to purchase.