The HAHTD series uses a highly accurate and reliable thermoset polymer based capacitance humidity sensor and high accuracy platinum RTD temperature sensor together with state-of-the-art digital linearization and temperature compensated circuitry to monitor humidity levels. The sensors are encapsulated in a 228.60 mm (9â€) long by 12.7 mm (0.5â€) diameter 304 S/S probe. A 60 micron HDPE filter protects the sensor for contaminants.