... N,P,K organic matter, salinity, and PH in the soil, fertilizer and plantsWith the function of time display, can automatically ... Testing range: 0.01% -1.00%Relative error: ±5%4. Soil moisture technical parameters:Moisture unit: % (m3/m3)moisture content rate ... 50HzDirect current: 18V, 5W (With tester) Function:Test N,P,K, PH, organic matter, soil PH, soil moisture,soil salinity, with storage and printing ...