Sense temperature of air streams in ducts and plenums. Sensors include a junction box with gasket to prevent leakage and vibration noise. These point-sensing thermometers feature a fast-responding aluminum sensing tip. Custom options include a NEMA 4 weatherproof connection box and an all stainless steel probe. Outside air sensors are designed to mount on conduit outside your building. They include an elbow type enclosure and sun shield.