DS-RF Selective Formaldehyde Module detects HCHO (0-1ppm), VOC, TVOC, temperature & humidity simultaneously with high accuracy (±30ppb) and fast response (<120s). Based on advanced micro fuel cell technology, it ensures selective HCHO detection free from interference by C2H5OH, NH3, CO, etc. Pre-calibrated and stable for 6-year service life, ideal for air purifiers, fresh air systems, smart homes, and wearable devices requiring reliable indoor air quality monitoring in global environmental sensing applications.More