Abstract: Systems, apparatuses, and methods are described for monitoring objects. A sensor positioned on an object (e.g., a door) is configured to measure a strength of a magnetic field of a magnet positioned on an associated object (e.g., the door frame). The measurements of the strength of the magnetic field made by the sensor may change over time (e.g., may decrease) due to changes in the positioning or alignment of the sensor or magnet. The positioning or alignment of the sensor or magnet may change due to use of the object (e.g., use of the door). One or more thresholds used by the sensor to determine the status of an object (e.g., to determine whether the door is open or closed) may be adjusted based on changes to the measurements over time.