COSI-Measure: Open source multipurpose measurement system Cost effective Open Source Imaging (COSI) aims to construct an affordable MRI scanner at low field using permanent magnets. In order to map the static magnetic field of the MR magnet, COSI-Measure was developed, which is an open source 3-axis multipurpose system for a total cost <3000€. Our system can be easily modified to be used for other applications such as electromagnetic field measurements, 3D printing, CNC machinery and many other scientific applications, that require submillimeter 3D movement. Status: confirmed