An Affordable Monitor for PM1, PM2.5, PM4, and PM10 Sizes This small, lightweight, battery operated handheld mass profiler, simultaneously monitors PM1, PM2.5, PM4 and PM10 levels. The multi-function rotary dial provides simple and efficient operation. The internal battery pack provides 8 hours of continuous operation or 24 hours of typical intermittent operation. This unit stores up to 2,500 sample events that can be viewed on the display or exported to a computer via the USB port. With the ever growing concern for the effects of indoor air and the concentration of fine particulate matter in relation to respiratory health, we know that this affordable and reliable monitor will be well received for a variety of applications. Please contact sales@metone.com for more information on pricing and delivery. Model 831 Aerosol Mass Monitor