Great! Quite expensive but works as advertised and greatly simplifies the Arduino based TDS controller project. Atlas Scientific is a leading name in scientific equipment and the documentation for this chip is top notch. As stated in the description you need a sensor with this chip, but almost any sensor with a BNC connector will work fine. I bought a cheap Chinese stylus for less than 1/3 the price of an Atlas stylus that works for my purposes, but if you want (and can afford) the highest level of accuracy, you can't go wrong with Atlas. Probe.
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