Magnetic field sensors (1) comprising field detectors (10) for detecting magnetic fields are provided with environment detectors (11) for detecting environments and with processors (12) for, in response to detected environments, performing processes such as loading calibration parameter sets and (re)calibrations for the field detectors (10), to allow the magnetic field sensors (1) to be used in different subsequent environments. The environment detectors (11) may comprise code detectors for detecting codes indicative for environments and may comprise user interfaces (13) for, in response to detected environments and via user interactions, selecting processes to be performed by the processors (12). Devices (2) comprise magnetic field sensors (1). Apparatuses (3) such as cradles removably fix the devices (2) and may comprise code generators (30) for generating the codes indicative for the environments.