The DynoMag has been developed by our partner the Acreo Swedish ICT. It is an affordable, easy to use and portable AC susceptometer and is an analytical tool for magnetic nanoparticle or magnetic material. The AC susceptibility for magnetic nanoparticles is not only influenced by the material itself, it is also affected by particle size, size distribution, molecules on the nanoparticle surface etc. The sum of these effects influences the frequency dependent AC susceptibility of the sample.