Price For: Each Item : Water Quality Testing Kit Type: Nitrate-Nitrogen Range : 1 to 15 PPM Sensitivity : 1.0 PPM Number of Tests : 50 Replacement Reagents : 4EWD9 Includes : (50) Nitrate #1 Tablets, (50) Nitrate #2 Test Tablets, (2) Plastic Test Tubes with Caps, Octa-Slide Views. er with Slide Bar and Instructions Test System : Colorimetric Country of Origin (subject to change) : United States