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YINMIK YK-E01B TDS EC tester has multiple measurement modes.
Household use most use PPM 500 mode to measure drinking water.
The PPM 700 mode is used to measure the PPM value of the solution with more impurities such as boiler water, rivers, lakes, wells and other surface water or groundwater.
There are two modes of conductivity : mS and μS , you can choose the function that suits you according to your requirements.