In this video, I show you how to construct and calibrate your own EC probe for use in hydroponics. Anyone can do this if you follow all the Arduino videos on this channel.
You may be interested in the following videos as well
Arduino Playlist (YouTube)
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Component list
1 x Arduino Uno any Arduino UNO board
1 x programming cable
1 x small breadboard
1 x 10k thermistors waterproof with metal casing any type
1 x 10k resistors 1/4W or 1/2W
1 x 1 k resistor
male to male breadboard connection wires