Magnetic investigation is a non-destructive method that allows for the localization of reinforcing bars within concrete columns using a device called a pachometer. The purposes of using this technique are as follows: For Destructive Testing: Pachometric investigation, by detecting the presence of bars, facilitates sampling such as core drilling by preventing these operations from affecting the most critical parts of the element, thus avoiding a loss of its characteristics. For Ultrasonic and Sclerometric Testing: Pachometric investigation prepares the examination surface for sclerometric and ultrasonic methods, which could be “interfered with” by the presence of bars. For Measuring Bars: Steel bars are often incorrectly placed or have diameters different from those specified in the design. Pachometric investigation can detect such discrepancies.