Potassium reaces, low, medium, high, Turbidimetric, Tetraphenylborate AG22-413 Description Agriculture Test Kit Dimensions/ Weight 113 x 113 x 62 mm Weight 105 g Budget Soil Test Kit AG22-414 Parameter: Nitrogen, Range: traces, low, medium, high, Method: Colormetric, Chemical Method: Ned. pH, 4 to 9pH (1 pH increments), Colorimetric, pH indicator.