... PH mV Meters,Pen type ph meter,Lab PH meter, ph tester, ph controller, digityal ph meter, digital ph monitorMicroprocessor PH mV Meters ... ,ManualDimensions: 210mm(L) 205mm(W) 65mm(H)Power: 9VDC, using AC adapters 110VAC/220VAC,60/ 50HzModel: PHS-3CWpH Range: 0.00 ... ,ManualDimensions: 210mm(L) 205mm(W) 65mm(H)Power: 9VDC, using AC adapters 110VAC/220VAC,60/ 50HzModel: PHS-3BWpH Range: 0.00 ...