... acid , organic matter, salinity, and PH in the soil, fertilizerand plant2.With the function of time display, can automatically record and save ... LCD shows, and will guide you how to operate.6.When in the test, it has the functions of playback, so it's very ... :1) Stability: A(absorbency of illumimation) drift less than 0.003 in three minutes.2) Repetitiveness: A(absorbency of illumimation) less than 0 ...