The design is impressive! And in this case, this design improves functionality. You can recognize a CO2 level by the color of the light on the top without the necessity to see a monitor. Very convenient! The device is useful to reveal locations and time intervals where you have a lack of oxygen.

The EMF meter from ERICKHILL was accurate! I live next to power lines and after my readings I had a professional EMF Reader verify my findings and with his device he had the same readings.

This IR thermometer works well. You can preset high and low alarms, it has a back lit display and measures to 1/10th of a degree. I like that you can adjust emissivity, which my older IR thermometer can't do. It is compact and includes a nice nylon pouch with belt clip.