Email this pagePrint this page Phosphate Test Strips 50/ pkg Go back to: Test Paper Quantity in Basket: none Product Code: P1042 Price: $9.60 Shipping Weight: 0.01 pounds Quantity: Phosphates react with molybdates yielding a yellow complex, which is then reduced to a blue product. This reaction requires 3 minutes of waiting time. Range: 0-10-25-50-100 ppm. 50 strips/pk.