86031 AZ IP67 Combo Water Meter-pH/COND./SALT/TDS/D.O features: * Large LCD to display multiple parameters simultaneously: pH, Conductivity or TDS or Salinity, Dissolved oxygen, Temperature (by using different probes) * Displayed parameter is decided by probe type * Water proof function as IP67 * Fast measuring of dissolved oxygen value * Accurate replaceable probes with anti-collision cap * Auto ranging for conductivity measurement * Auto temperature compensation (ATC) * 99 points memories w/recall function * Multiple points calibration: 3 points for pH, 1 point for D.O., 4 points for conductivity * Manually altitude and salinity compensation function for D.O. measurement * Easy replacement probes * Temperature unit ℃/℉ is switchable * 1 hour auto power off * Excellent to use in fresh or sea water aqua farm