Indicates the margin built around the thresholds. This margin prevents unnecessary state changes when the Sensor reading ...

Indicates the margin built around the thresholds. This margin prevents unnecessary state changes when the Sensor reading may fluctuate very close to its thresholds. This could be due to the Sensor's tolerance/accuracy/resolution or due to environmental factors. Once a threshold is crossed, the state of the Sensor should change. However, the state should not fluctuate between the old and new states unless the Sensor's change in the reading exceeds the hysteresis value. The units for this measurement are determined by BaseUnit*UnitModifier/RateUnit.