An adjustable security sensor device is described. The device comprises a magnetic field sensor, a user input element, and a processor. The magnetic field sensor measures and samples magnetic fields from a magnet external to the device. The magnetic field sensor generates a first range of magnetic fields measurements sampled based on a first position of the magnet relative to the magnetic field sensor. The user input element identifies a second range of magnetic fields measurements based on a second position of the magnet relative to the magnetic field sensor. The device generates a sampling of magnetic fields measurements using the magnetic field sensor, compares the sampling of magnetic fields measurements with the first range of magnetic fields measurements and the second range of magnetic fields measurements, and identifies a position of the device relative to the magnet based on the comparison.