When quick detection of rain or snow is needed Link4's precipitation sensor is the answer.
  This smart design can detect just a single rain drop, while its heated grid resists false triggers from condensation, and melts snow for year-round precipitation detection.
 If you're protecting crops, customers, merchandise, have an open roof, shade roof, or other concerns, this is an excellent choice as a stand alone sensor or combined with a tipping bucket for added protection.