The OMEGA® HHTP21 handheld particulate, humidity, and temperature meter from OMEGA Engineering (Stamford, CT) measures fine and coarse particle pollution from many different sources. Features include fine particulate matter (PM2.5) measurement, health index (0 to 9) detection and alarm, PM2.5 time weighted average reading, data hold and max/min with time stamp function, six-color LED indication air quality at good/moderate/poor, and preset warning point of buzzer alarm, LED, and alarm output. The meter monitors particulate pollution in burning plants, petrochemical facilities, thermal power plants, restaurants, hospitals, mining facilities, metal refineries, and commercial and public buildings.

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