The Milwaukee pH/EC/TDS Meter MW801 PRO combo meter allows you to measure pH, EC (conductivity) and TDS with a single meter and one single probe. The design of the Milwaukee pH/EC/TDS Meter MW801 PRO is focused on simple operation and ruggedness. With a single probe, big screen, easy calibration, the Milwaukee MW801 is exceptionally simple to operate. A tough meter build and a rugged but replaceable probe means that you can expect years of use.Milwaukee pH/EC/TDS Meter MW801 PRO+ combi meter for pH, conductivity and TDS+ measuring range pH: 0.0 - 14.0H+ measuring range: conductivity: 0 - 1990S/cm+ measuring range TDS: 0 - 1990 ppm+ resolution pH: 0.1 ph+ resolution conductivity: 10S/cm+ resolution TDS: 10 ppm+ accuracy pH: +/- 0.2+ accuracy conductivity and TDS: +/- 2%+ automatic temperature compensation 0 - 50C+ large easy to read display+ factory calibration with a simple, single point manual calibration for both pH and conductivity+ 150 hours of battery life with continuous