• For electric baseboard & fan-forced heaters
• Dual-diaphragm sensor
• Sensitive to 2 degree temperature changes
• 4-wire application

D.O.T. REGULATED:   Ships via  GROUND  transport  only due to mercury content.   [ No Overnight, 2nd Day or 3rd Day Select delivery options, sorry. ]   Also no shipping via USPS or to USPS Buildings or PO Boxes.    = =   Cannot be shipped to Alaska or Hawaii or any island not accessible by road.   = =

EPA RESTRICTED:   This product  can  NOT  be shipped to the following states:  California  [ Prop 65 ]