Review on Gravity Analog Electrical Conductivity Sensor by Jathan Louis

EC sensor in this high quality kit. You need to make sure the tip is glass. Inside the glass tip is a loop with two square electrodes between the inner parts. The electrode is supplied with a screw top sample cup and a rubber boot on top into which the electrode is inserted. I personally don't use the cup that comes with the kit. I powered this board with 3.3v from an ADS1115 pi hat installed on a raspberry pi. This model showed better results compared to the CQRobot TDS sensor. I was able to plot a curve that is reasonably accurate for my use by reading the RO/DI output drop by drop compared to a real conductivity meter. Using this curve along with scipy.interpolate.interp1d I was able to more accurately read the EC of water anywhere from zero to 5 km. It's worth it.