Need help with EC sensor

What is the best sensor in the market?
Some confusion about DFRobot's EC sensor. Couldn't find the unit of the measurement and can I use the TDS sensor to measure EC?

Welcome - I cannot answer that question for several reasons. You did not define what an EC sensor is so I took a SWAG and assumed the electrical conductivity sensor (EC sensor) which measures the electrical conductivity in a solution. Some common applications are aquaculture and water quality testing .

That is a subjective question which there is no answer.

What are you measuring, what are the accuracy tolerances, what is the ambient, what is the liquid???

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