Brilliant kit, cheap and it works
This is a slightly improved TDS-3 from the one I bought myself previously, it now features the Celsius & Fahrenheit temperatures with a decimal place, my older one, still working, only showed whole temperature numbers.
I use these to check the salt content of swimming pools using the salt to chlorine electrolysers. It's the only useful way of measuring salt density, as I've tried using traditional floating density type sensors, and they are hopeless at the low levels of salt (5% - 500ppm) that is needed in the pools.
These are dirt cheap, compared to the ridiculous prices you see in the dedicated pool shops in France.
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