FNIRSI SFD?02 4 in 1 Indoor Air Quality Monitor

1. Real-time HCHO & TVOC Detection 2. HCHO range: 0–2000?ppm (electrochemical sensor) 3. TVOC range: 0–10?mg/cubic meters (semiconductor sensor) 4. Audible/visual alerts when thresholds exceeded; default thresholds: 0.08?mg/cubic meters for HCHO and 0.30?mg/cubic meters for TVOC 5. Comprehensive Air Quality Assessment 6. Displays formaldehyde safety in 5 grades 7. Includes temperature, humidity, and real-time clock display 8. Records past data for trend analysis 9. Calculates spatial averages across monitored spaces 10. Estimates remediation time, cost, and materials based on room size 11. 2.4-inch HD tempered-glass display with adjustable backlight 12. Compact and lightweight, 75×45×95?mm 13. Built-in 1000?mAh lithium battery delivers 8–10?h runtime 14. USB-C fast charging (5?V/2?A), fully charged in ~1.5?h 15. Supports operation while charging