First inspect the sensor to make sure there is no damage. Then hold the sensor vertically and carefully remove the protective cap (typically black or red) from the sensor tip. Calibrate the sensor and place it in service. IC Controls pH sensors are shipped with a protective cap containing pH electrode storage solution. The storage solution extends the life of the pH reference electrode during storage. If the sensor needs to be returned to stock, carefully replace the protective cap including the storage solution. Check out our YouTube video.