Features [Multi Functional] Quickly and accurately detect six types of dust particle sizes: 0.3μm, 0.5μm, 1.0μm, 3.0μm, 5.0μm, 10μm, can also detect the concentrations of PM2.5 and PM10 in the air. [Two Measurement Modes] Particle counting mode, concentration measurement mode, one key to switch, simple to operate, fast and efficient. [Data Storage] Can store thousands of sets of data, record measurement results at different time periods, supports USB connection to computer for printing or data backup, no need to download software. [Fast Measurement] Made from ABS and TPU material, hard wearing, long lasting and scratch resistant. Built in micro vacuum pump, with faster response speed, ensuring fast and accurate measurement. [Practical Design] Foldable bracket design on the back allows for easy measurement. Equipped with 2.8 inch high definition LCD display screen, the interface is clear at a glance. Spec: Item Type: Dust Particle Counter Material: ABS Particles Detection Range: 1.0μm, 3.0μm, 0.3μm, 0.5μm, 5.0μm, 10μm: PM2.5, PM10 Particle Size: 0.3μm, 0.5μm, 1.0μm, 3.0μm, 5.0μm, 10μm: PM2.5, PM10 Counting Efficiency: 0.3μm at 50%; 100 percent when >0.5μm (complies with ISO 21501-4 and JIS) Particle Size Resolution: Sampling Flowrate: 2.83L/min (0.1ft³) Error: 5% (2000000 particles/ft³) Battery: 3.7V lithium ion battery 2000mAh x 1 (built in) Working Temperature: 0~50℃ Working Humidity: 10%~90% RH, no frost or condensation Storage Temperature: -20~60℃ Storage Humidity: 0~95% RH, no frost or condensation PackageList: 1 x Dust Particle Counter 1 x USB Cable 1 x User Manual 1 x Storage Box Package List 1 x Dust Particle Counter 1 x USB Cable 1 x User Manual 1 x Storage Box