Setup the Barometric pressure Tibbit in visual LTPS Web Configurator or as described in Configuring TPS Agent:
After writing settings and reboot LTPS Tibbits tab with subtab Sensors will appear:
The temperature in Celsius degrees, the pressure percents mm/Hg.
To increase the accuracy of measurements, remove tibbit case.
The value are updated during AggreGate Client synchronization (3 minutes by default). You can reduce synchronization period or force synchronize to get actual values.