... lock the reading.2. 5-minute auto shut off feature, battery won't run off ConductivityTDSDegrees CelsiusAccuracyN.WSize0--9990us/cm0--5000ppm 0.1 ... )Shift between TDS & Conductivity: The factory default TDS data, if the conductivity data of the solution is needed , please touch ... it out of the solution to read. 4. After reading ,turn off the meter ,wipe clean the electrode before sleeving it.Maintenance ...