... ISO9001 quality certificate Test N, P, K, Test humic acid,organic matter,salinity,and PH in the soil, fertilizer and plants ... the first time. Characteristic:Can quickly test N,P,K organic matter, salinity, and PH in the soil, fertilizer and ... : 80V- 240V,50HzDirect current: 18V, 5W (With tester) Function: Test N,P,K, organic matter, with formula function, can provide guidance for fertilizing ...