OCRKJ D9-H (AKA KMOON K6-H)

SoCGigaDevice gd32f103rct6

CO2:  SenseAir S8 LP (400–2000ppm Accuracy CO2 ±40ppm ±3%,  Up to 10000ppm extended range) (30$)

PM2.5Plantower PMSA003 (16-20$)

TVOC (hydrogen and carbon monoxide): Figaro tgs2600 - pdf (7$)

HCHO: Winsen ZE08-CH2O (22$

Temperature and humidity: SHT20 (4$)

Accum: LIDIO 3.7v Li-Ion 3000 mAh 963760P (16$)

LCD:  3.5" 320x480 JLT35010A (~10$)