Replacement Sensor For Eutech Elite PCTS TesterElite PCTS (PCTS) Replacement Sensor This is a replacement sensor module for the Elite PCTS tester. It is very easy to replace the sensor on your Elite PCTS once it shows signs of calibration failure or fluctuating readings. No need to buy a whole new tester, just purchase a sensor at a much lower cost. Replacing a sensor Ensure you have dry hands. Hold onto the ring with the pH CTS sensor facing you. Twist the ring clockwise. Set the ring aside for