... type ph meter, PH controller, PH monitor, TDS meter, EC meter, CF meter, ORP controller PH meter, digital ph meter, pen type ph meter, PH controller, PH monitor ... (Model PHscan10)0.1pH (Model PHscan20)Calibration Points: 2 pointspH Buffer Options: NIST, pH4.00, pH9.18Reference Cell type: Replaceable KCl ...