Precise air monitoring: The device measures fine particulate matter in PM2.5 and PM10 categories from 0 to 999 micrograms per cubic metre for reliable indoor air assessment. Health focused display: Coloured and numerical indication with optional acoustic alarm warns when particulate concentrations may be harmful to health. Comprehensive climate data: The display permanently shows ambient temperature from minus 9.9 to 50 degrees Celsius and relative humidity from 1 to 99 percent. High sensitivity sensor: The precision particulate sensor detects particles from 300 nanometres up to 10 micrometres, covering allergens and industrial emissions. Versatile application: Suitable for residential buildings, offices, schools and public spaces, powered by 5 V adapter in a compact 90 x 91 x 33 mm format., Weight: 1.0582188576 pounds, Manufacturer: Umarex