public void PHUnitsSet(PHSampleUnitsEnum ToUnits) { if (ToUnits != PHUnits && PH != null) { // convert the numbers if (ToUnits == PHSampleUnitsEnum.Water) { // pH in water = (pH in CaCl X 1.1045) - 0.1375 PH = MathUtility.Subtract_Value(MathUtility.Multiply_Value(PH, 1.1045), 0.1375); } else { // pH in CaCl = (pH in water + 0.1375) / 1.1045 PH = MathUtility.Divide_Value(MathUtility.Add_Value(PH, 0.1375), 1.1045); } } PHUnits = ToUnits; }