The HX15A series two wire remote transmitters measure relative humidity and temperature over a large temperature range (-40 to 180°C). The HX15A-W 64 mm (2.5") stainless steel probe is used for wall mounting. The HX15A-D 216 mm (8.5") stainless steel duct probe has a removable flange. The probes are connected to housings with 1 m (40") fluoropolymer cables. Custom length cables available on special order. Probes are not field replaceable.