The HATLDC multi-point flexible duct average temperature transmitter incorporates four or nine high accuracy platinum RTD’s encapsulated in a 7.94 mm (0.3125â€) OD, soft copper probe and is available in various lengths. All probes provide excellent heat transfer, fast response and resist moisture penetration. A transmitter that provides a high accuracy signal with excellent long term stability, low hysteresis and fast response for measurement of duct temperatures. A hinged lid, weatherproof enclosure and LCD in either °C or °F are provided.