Feature: 1. Large Battery Capacity: This instrument has 2000mah battery capacity, long battery life. ABS material, strong and durable 2. Principle: The instrument uses the principle of laser scattering to accurately measure the number and quality of different particle sizes in the air per unit volume 3. Fast Test Speed: Designed to detect the number of dust particles per unit volume in a clean environment, with many functions, high test accuracy, fast speed, easy to carry 4. Real Time Recording: A sampling can measure the dust particle number of six particle sizes at the same time, and the detection results can be recorded in real time, which can be used for research, detection and evaluation of various environments 5. Widely Used: Can be widely used in microelectronics, medical pharmaceutical, biochemical products, food hygiene, cosmetic products, highly accurate machinery, fine chemical industry and other departments Specification: Item Type: Dust Particle Counter Material: ABS Weight: Approx. 596g / 21oz Product Size: Approx. 18.3x7cm / 7.2x2.8in Particulate Matter Detection Range 0.3μm to 10μm Particle Size :0.3μm, 0.5μm, 1.0μm, 3.0μm, 5.0μm, 10μm Counting Efficiency :0.3μm 50%, Greater Than 0.5μm 100% (According for ISO 21501 4 and JIS) Particle Size Resolution: 0.5 mm<15% (According for ISO 21501 4) Sampling Flow Rate :2.83l/min (0.1ft³) Battery Type: Lithium Battery (Shipped with Built in Battery) Battery Model: None Battery Capacity: 2000mah. Package List: 1 x Dust Particle Counter1 x Storage Box1 x USB Data Cable1 x English Instruction Manual Note: 1. It should be used in a clean environment to prevent damage to the laser sensor.2. do not disassemble the instrument or put it into the fire.3. prevent the instrument from violent vibration and falling.4. Do not let liquid flow into the instrument.6. when the machine into different environmental temperatures, especially from the low temperature environment into the high temperature environment, the water may dew on the instrument, must be stable for half an hour, then power, to measure the values. No water, solution or other liquid shall enter through the sampling air intake.