... mV Meters,Pen type ph meter,Lab PH meter, ph tester, ph controller, ISO CE benchtop conductivity meter Automatic Calibration:The meters can ... calibrate 1 point in each of the measuring ranges. From Setup ... K=0.1, 1, 10 (Adjustable)Power Requirements: DC9V, using AC adapters, 220VAC, 50HzDimensions: 210(L)×205(W)×65(H ...