Large display continually monitors the primary IAQ (Indoor Air Quality) parameters:
Poor air quality may cause tiredness, inability to concentrate, and even illness (i.e., Sick Building Syndrome). This instrument is ideal for monitoring indoor air quality in crowded public spaces with potentially high levels of CO
2 (carbon dioxide) such as offices, factories, classrooms, hospitals and hotels. Recalls min/max CO
2 levels and provides visual alarms for maximum CO
2 threshold. Automatic Baseline Calibration (ABC) and maintenance free NDIR (non-dispersive infrared) CO
2 sensor ensure long-term accuracy, stability and reliability. Comes with an AC adapter (800059) and will stand on a desk-top or wall mount.
Dimensions: 4½" × 4¼" × 1" (108 × 115 × 25 mm)
Weight: 6 oz (170 g)
News Link:The Hot New Back-to-School Accessory? An Air Quality Monitor
 - by Emily Anthes, NY Times - Oct. 10, 2021