Voltcraft-CO-100-Room-Air-Meter-Voltcraft-CO-100-P-The-Voltcraft-CO-100-Room-Air-Meter-is-a-stationary-CO-sup 2-meter-for-the-determination-of-the-carbon-dioxide-concentration-CO-sup 2-in-the-ambience-air-with-the-precise-&-long-term-stable-NDIR-measuring-method-Non-Dispersive-Infrared-Absorption-Measurement-P-P-Bad-air-quality-is-usually-the-cause-for-illness-or-tiredness-&-decreases-the-concentration-&-efficiency-The-CO-100-is-used-to-monitor-the-carbon-dioxide-content-in-t