... ,P,K in fertilizer and organic matter in soil, in the plants. 2.Test PH and salinity in soil 3 ... acid , organic matter,salinity, and PH in the soil, fertilizer and plants, and also can store datum, ... humic acid , organic matter, salinity, and PH in the soil, fertilizerand plant2.With the function of ... absorbency of illumimation) drift less than 0.003 in three minutes.2) Repetitiveness: A(absorbency of ...