Product review (5 stars): A highly recommended tool for productivity
The reason why I bought this CO2 meter was my curiosity as to find out what was the level of CO2 in a bedroom while sleeping at night with the doors and windows closed, and using a window air conditioner.

I was very surprised to see the reading next morning, it was well above the recommended levels.

I found the product to be very useful, and though everyone knows that you need to open the windows in your home or office to let in fresh air, now with this device you have a way to measure with numbers, how often you actually need to do so.

Highly recommended for office productivity, there is a lot of information on the web, about the correlation of CO2 levels, and workers productivity.
High levels of CO2 have an effect on employee productivity, their ability to think, their ability to reason, and the desire to work.

So before you think that an employee is lazy or not smart enough; I will recommend you to install one of these devices in the office, and compare readings during the day.

Also make sure that you take readings were you kids do their homework, and study.

CO2 Levels in a room and effects
250-350ppm Normal background concentration in outdoor ambient air
350-1,000ppm Concentrations typical of occupied indoor spaces with good air exchange
1,000-2,000ppm Complaints of drowsiness and poor air.
2,000-5,000 ppm Headaches, sleepiness and stagnant, stale, stuffy air. Poor concentration, loss of attention, increased heart rate and slight nausea may also be present.