OHM A unit of resistance to electrical current and ohm is the reciprocal of mho. Symbol is W . 1000 ppm of NaCl means 1000 parts NaCl in 1,000,000 parts of pure water. The opposition of a medium which opposes or reduces current flow. Any substance which reduces or eliminates current flow, reciprocal of conductivity.
Scale can build up in cell cup of instrument.
This will insulate the electrodes from the solution to be measured, so it must be free from scale. A means of measuring by graduated marks. Myron L Instruments use both linear and non-linear scales depending on the model instrument. When that same solution is cooled or chilled, it will decrease its conductivity. Temperature compensation means the conductivity reading will automatically adjust to what that solution would have read at a standard temperature.