Honeywell Hunidity Controller, Operates Humidification Equipment on RH Fall or Dehumidification Equipment on RH Rise, SPDT, 24Vac-240Vac, 50/125 Degree Temperature Range, 5% RH Differential, 20/80% Operating Humidity Range,Fully Enclosed, Dust Free, Snap Acting, Mounts Vertically on 2″x4″ Junction Box