What module can read TDS in ppt?

Using Arduino Sensors
1

Hello everyone. I want to measure TDS in water. I found this module, but it only measures around <1000 ppm (<1 ppt). Is there any module that can measure <10 ppt? And it can be controlled via Arduino
Thank you very much

TDS-meter-with-readings-only-in-serial-monitor
TDS-meter-with-readings-only-in-serial-monitor988×720 62.8 KB

2

Please show link to your module

3

Here, but it can monitor tds <1000 ppm (<1ppt) but I want to monitor TDS up to 10ppt

4

I quoogled
and found this

ppt to ppm conversion

How to convert ppt to ppm

ppm and ppt are defined as:

1ppm = 1/10^6 = 10^-6

1ppt = 1/10^12 = 10-12 = parts per trillion

So 1ppm = 10^6ppt
measuring less than 10 ppt means measuring 0.00001 ppm
5 decades smaller !

or do you mean parts per thousand?

5

If you mean ppt = parts per thousand, carefully dilute the sample by a factor of 10, measure the TDS of the diluted sample, and multiply the result by 10.

6

No, I want to have value in real-time in river. So it is impossible

7

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