Membrane kit for DO AZ 86031 (5 pc/pk)

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
Waterproof 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 seawater aqua farm