Gikfun 2PCS TDS Sensor Water Conductivity Meter, 0-1000ppm Analog Output Sensor Module with Waterproof Probe, Compatible with Arduino for Hydroponics, Labs, Water Quality Testing EK2169
$22.99
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Wide Voltage Input: 3.3V to 5.5VWorking Current: 3 ~ 6mA, TDS Measurement Range: 0 ~ 1000ppmGood Compatibility Output: 0 to 2.3V analog signal output, compatible with 5V or 3.3V controller.AC Excitation Source, effectively prevent probe from polarizationEasy to Use: Arduino compatible, simple connection, plug and play without soldering. You can build a TDS detector easily to measure the TDS value of liquidIt can be used in water quality application, such as domestic water, hydroponics. So you can easily DIY water purity tester
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