... Power:Alternating current: 80V- 240V,50HzDirect current: 18V, 5W (With tester) Function:Test N,P,K, PH, organic matter, ... soil PH, soil moisture,soil salinity, with storage and printing function, built-in the amount of nutrients ... amount according to needs, with printing function,with “intelligent formula fertilization software system” CD, can connect with computer for data storage, ...