Monitor your indoor air quality accurately and easily with a laser particle counter. Designed specifically for consumers, these laser particle counters give you an accurate measurement of airborne particle concentrations within your home or office. Each counter counts small particles, such as fine dust, bacteria, mold, smoke, and smog as well as large particles, such as coarse dust, pollen, large bacteria, plant spores, pet dander, and dust mite feces. Readings are displayed on easy-to-read LCD screens. If you have allergies or asthma, these units are especially helpful tools for maintaining contaminant-free and symptom-friendly air.