The Telaire/Amphenol Advanced Sensors GEH3 Series 3% accuracy humidity transmitters are designed specifically for commercial HVAC/BAS applications. The room, duct, and OSA transmitters have replaceable sensor tips and switch-selectable outputs of 4-20 mA, 0-5 VDC or 0-10 VDC. The GEH3 Series also has an optional temperature transmitter, which has the same selectable outputs as humidity. All duct and OSA units come in weather-resistant enclosures rated for IP42 or NEMA 3R applications.