Overview: Handheld dust quick detector is the special detecting instrument used to measure the value of PM2.5 (repairable particles) and PM10 (inhalable particle) in the air. It is a high-tech product developed independently and integrating gas dynamics, digital signal processing and optical-mechanical-electrical integration on the basis of absorbing oversea advanced high sensitivity micro laser sensor technology. The device is characterized by high test precision, stable performance, strong multiple functions and easy and convenient operation and can be used widely for determination of indoor and outdoor public environment and atmospheric environment, PM2.5 air quality detection and PM2.5 dust particle amount. II.Specification: - PM2.5 air quality detection: PM2.5 Pm10 - Range: (0-1000ug/m3 ) - Concentration unit: ug/cubic meter (ug/m3) - Detection sensitivity: 1ug - Measurement error: < 20% - Three-channel dust particle counter: 0.3um 2.5um 10um - Flowrate: 1L/min - Concentration unit: piece/L - Sampling method: pumping - Sampling principle: light scattering - Light source: laser diode - Detection method: manual - Automatic power-off function: it will power off automatically if there is no operation within 2 minutes at power-on state. Environmental condition: - Application environment: temperature scope: 5~45degree C - Humidity range:<90%RH - Storage environment: temperature scope: -20~60degree C - Humidity range:<90%RH - Sampling time: 50s - Resolution ratio of sensor: 1ug/m3 - Storage record: 1000 groups of data - Temperature measurement range: -40~ +125 degree C Precision 0.5degree C - Humidity measurement range: 0-100%RH Precision 2%RH - Screen size: 2.8"" - Display screen: 2.8320*240 LCD color back light Power supply: - Adaptor: 100-240VAC 50/60H output; DC9V=500mA (the connection is used for charging and should be used at power-off state). - Connection of USB port line - 7.4V Rechargeable lithium battery/1100mAh (the battery cannot be dismantled at will. Please contact the manufacturer is it needs to dismantle the lithium battery). - Work time of the battery: the time for continuous test is longer than 3 hours. - Display of remaining energy: three-grid battery electricity display (it needs to charge if one grid of electricity is left. The charging should be made before the battery electricity displays red. This will result in reducing service life and capacity of the battery). The electricity is tested once at the time of power on. - External size: 245*40*85mm - Weight: 325g (battery included)