The software is regularly updated by a team of Microsoft trained engineers at the Rotronic factory in Switzerland, ensuring full compatibility with the latest products. These include CO2 handheld and display instruments & the low cost HVAC HygroFlex1 and PF4 differential pressure sensors.

HW4 software has been developed extensively recently and includes the features below:
- Automatic download of recorded data from data loggers and wireless modules
- Graphical interface with customer process details, tabular data also available
- Statistical and psychrometric values available e.g. dew point
- On-screen display of alarms. SMS, email and relay alarm options
- Customer specific room layout graphic
- Detailed sensor calibration report
- OPC client compatible including 64-bit systems
- Password protection and assignable user access
A 30-day trial version is available. HW4 specifications and product overview are available on the Rotronic website