[Comprehensive Air Quality Test]: This 15-in-1 air quality tester integrates multiple test functions for measuring , CO, CO2, PM0.3, PM1.0, PM2.5, PM10, formaldehyde, TVOC, temperature, humidity, as well as time display, alarm, and countdown functions, providing a complete solution for your air quality needs. [Warning & Visual Alert]: After connecting to WiFi, users can set the alarm value according to their needs. Once the measured data exceeds the standard, the device immediately sends out three emergency beeping alarms, and the interface color changes with the air quality (green-nice, orange-warning, red-bad), intuitive warnings to immediate response. [Intelligent Linkage Control]: Use high-end infrared and laser sensors to measurement accuracy. It can link with the smartplug to control external devices.Applicable to families, schools, hospitals, children's rooms, hotels, restaurants, cars, and other places. Name: Air Quality Tester CO2 detection ranges: 400-5000PPM, ±50 ±5%PPM CO2 detection sensitivity: 1PPM CO detection ranges: 0-999PPM, ±10PPM CO detection sensitivity: 1PPM TVOC detection ranges: 0-9.99mg/m³, ±0.05mg/m³ HCHO detection ranges: 0-1.99mg/m³, ±0.05mg/m³ PM2.5 detection ranges: 0-999μg/m³, ±10μg/m³ PM2.5 detection sensitivity: 1μg/m³ PM1.0 detection ranges: 0-999μg/m³, ±10μg/m³ PM10 detection ranges: 0-999μg/m³, ±10μg/m³ PM0.3 detection ranges: 0-999μg/m³, ±10μg/m³ Temperature measurement ranges: -10-50°C Temperature measurement error: ±2℃ Humidity measurement ranges: 0%-99% RH Humidity measurement error: ±5%RH Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Colour:Black Material:plastic Package Contents: 1 x Air Quality Tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.