In reed sensor applications it is important to understand the exact pull-in and drop-out fields. This information then allows one to properly position the magnet and sensor well within appropriate guard bands and avoid any tolerance issues. Most users have no idea what the actual magnetic field looks like. Presenting the fields in a three dimensional view gives the user a better chance to have an optimized design. This will help define adequate operate and deactivate points. Additionally, this will insure operation takes place well within the magnetic envelopes to avoid tolerance issues. We can insure acceptable hysteresis between the operate and deactivate points. We can optmize the sensor and magnet costs.