... 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, CF meter, condutometer ... -A CNB lithium 1.5V batteries (included)Battery life: 200 hours continuouso Operating Temperature: 0 to 60 °CDimensions: 180mm Dia.35mmPH ...