Economical portable conductivity meter, selectable cell constant and temperature coefficient, 1 to 3 point calibration, setup menu contains 8 options, accuracy 0.5% F.S.

Professional portable conductivity meter, selectable TDS factor, 1 to 5 points calibration, setup menu contains 12 options, accuracy 0.5% F.S.

Professional portable conductivity meter, selectable seawater or practical salinity measurement modes, 1 to 5 points calibration, setup menu contains 11 options, accuracy 0.5% F.S.

Professional portable conductivity meter, selectable TDS, salinity and resistivity measurement modes, 1 to 5 points calibration, setup menu contains 12 options, accuracy 0.5% F.S.