This object represents the value to be compared against. The
p2mpThreshType determines the way in which it is used.
It is used as follows:
if p2mpThreshType is ..
highThresh : Notify if data sample exceeds the p2mpThreshValue.
lowThresh : Notify if data sample recedes below the
p2mpThreshValue.
upChange : Notify if data sample increases by more than
p2mpThreshValue.
downChange : Notify if data sample decreases by more than
p2mpThreshValue.
upLimit : Notify if data sample crosses p2mpThreshValue while
increasing in value.
lowLimit : Notify if data sample crosses p2mpThreshValue while
decreasing in value.