In this report the magnetic properties of mass standards are determined using a susceptometer. Most models used for estimation of magnetic susceptibility and permanent magnetization, with the BIPM susceptometer, are based on the assumption of a magnetic field intensity from a magnetic dipole. This field model has been compared to magnetic field intensities derived by using the Biot-Savart Law. The main conclusion is that there are no significant differences between the different models for determining the magnetic properties of the mass standards when the measurements are performed at distances larger than 17 mm from the susceptometer magnet. It is adequate to use the dipole approximation to model the field of a cylindrical magnet. Furthermore the measured results of the magnetic properties of mass standards depend on the magnitude of the magnetic field intensity. SP has during this project, participated in an international comparison for determination of the magnetic properties of mass standards. Calculations of the permanent magnetization and susceptibility agree with results obtained by other participants in the international comparison