The project is about a meter called Water Content Monitor WCM411. It is a moisture meter used in this assignment to measure the actual moisture content of raw bentonite. It is made in Finland with a quite new technology. It is based on infrared measurement technology and is completely non-contact. The purpose of this project is to measure the moisture content of raw bentonite in a reliable manner so that the new plant to be built in Sandskär can control the temperature and amount of drying air to the bentonite. The equipment needs to be calibrated before its initial use. Three methods can be used to calibrate the equipment so that it can measure the actual moisture content of the crude bentonite. The first method is based on taking a sample and determine calibration factor. The second method is based on guessing a value `Learning by doing''. The third method is based on doing mathematical calculations to find calibration. At the end the master's student reviews the key elements that have been discovered which allows one to start up the equipment in a reliable manner. You can read about the instances that can be helpful to know before taking equipment into use. Through discussion, you can see which questions concerning equipment work that the master's student has taken up and which measures student has suggested. Finally, summarizing the student has the conclusions that can be made after this work