Temperature and Relative Humidity Monitoring Leading manufacturer of temperature, humidity, atmospheric pressure, carbon dioxide CO2 transmitters, data loggers, monitoring systems, data acquisiton systems, thermometers, hygrometers, barometers. T3110 IT3110 Temperature and humidity outdoor, indoor probe with 4-20mA output T3510 T3510 Web Sensor – remote thermometer hygrometer with Ethernet interface T3511 T3511 Web sensor – remote thermometer hygrometer with Ethernet interface. Weather sensor for environment monitoring. H4311 H4311 Temperature transmitter with RS485 output Temperature transmitter for Pt1000 sensors with two relay outputs. Outdoor, indoor use. For external Pt1000 temperature probe. Three two-state inputs.