![Velleman DEM105 Temperature and Humidity Data Logger with USB Interface, Multi-Colour : Amazon.co.uk: Business, Industry & Science Velleman DEM105 Temperature and Humidity Data Logger with USB Interface, Multi-Colour : Amazon.co.uk: Business, Industry & Science](https://m.media-amazon.com/images/I/21rYge8b3jL._AC_UF894,1000_QL80_.jpg)
Velleman DEM105 Temperature and Humidity Data Logger with USB Interface, Multi-Colour : Amazon.co.uk: Business, Industry & Science
![Velleman DEM202 Professional Sound Level Meter Datalogger with USB Interface, Multi-Colour : Amazon.co.uk: DIY & Tools Velleman DEM202 Professional Sound Level Meter Datalogger with USB Interface, Multi-Colour : Amazon.co.uk: DIY & Tools](https://m.media-amazon.com/images/I/51XGX0kHy3L._AC_UF894,1000_QL80_.jpg)
Velleman DEM202 Professional Sound Level Meter Datalogger with USB Interface, Multi-Colour : Amazon.co.uk: DIY & Tools
![Velleman DEM202 Professional Sound Level Meter Datalogger with USB Interface, Multi-Colour : Amazon.co.uk: DIY & Tools Velleman DEM202 Professional Sound Level Meter Datalogger with USB Interface, Multi-Colour : Amazon.co.uk: DIY & Tools](https://m.media-amazon.com/images/I/51t1EZxITmL.jpg)