Explanation how to measure magnetic fields on a magnetic separation system with a gauss meter. For more info: https://www.goudsmitmagnets.com/solutions/accessories/magnetic-field-meters/gauss-meter-teslameter Some reasons cause a decrease of the magnetism of a permanent magnet. Measuring the magnets in your process is very important for your HACCP audits to make sure the magnet has not lost value over time and meets your quality standards. This is a basic instruction that enables to measure it yourself with a gauss meter.