Electrical conductivity may be high in a river without any visible effects on the clarity of the river water, so it needs to be measured with a suitable sensor. What are the natural controls on ...

If your processing application requires pressure, temperature or conductivity sensing, or perhaps a combination of all of these critical measurement and monitoring ...

We hope that the Hackaday readers also think that the door sensor that [Alexander] developed ... he decided to use the strike plate and door conductivity to detect someone walking in.