... N, P, K, humic acid , organic matter, salinity, and PH in the soil, fertilizerand plant2.With the function of time display ... .5.Big-screen LCD shows, and will guide you how to operate.6.When in the test, it has the functions of playback ... of illumimation) drift less than 0.003 in three minutes.2) Repetitiveness: A(absorbency of illumimation) less than 0.0053) Linearity errors ...