... acid , organic matter,salinity, and PH in the soil, fertilizer and plants, and also can store datum, remote ... K, humic acid , organic matter, salinity, and PH in the soil, fertilizerand plant2.With the function ... of time display, can automatically record and save the time of test sample.3. ... .00% Error: ±5%3)Alternating current (AC): 80V~240V,50Hz; 2) Direct current: 18V,5W (With tester)The ...