PH meter, digital ph meter, pen 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, TDS meter, EC meter ... : 2 pointspH Buffer Options: NIST, pH4.00, pH9.18Reference Cell type: Replaceable KCl gel filledDisplay: LCDBattery: Three G13-A CNB lithium ...