Johnson Controls W351Ab-2C Humidity Controller, Surface or Din Rail, 10 %,eBay Shop Categories JOHNSON CONTROLS W351AB 2C Humidity Controller, Surface or DIN rail, 10 %, JOHNSON CONTROLS W351AB 2C Humidity Controller, Surface or DIN rail, 10 %, Item Description Humidity Controller, Product Type Humidity Controller, Dehumidifier Control Compatibility Dehumidifier Control Compatible, Humidifier Control Compatibility Humidifier Control Compatible, Control Range 10 Percent, Humidity Differential 10 Percent, Input Voltage 120