This Grove sensor plugs into the Grove environment and gives you the instant ability to read the concentrations of VOCs (Volatile Organic Compounds). Connected to an analog port, it reports concentrations in the 1 to 50 parts-per-million (PPM) range as a resistance reading between 10k and 100k.

Specifications:

• Grove compatible interface (analog)
• WSP2110 sensor based
• Target materials:
  • Formaldehyde (HCHO)
  • Benzene
  • Toluene
  • Alcohol
• 5VDC
• Sensitivity: Rs(in air)/Rs(10ppm HCHO)≥5

• HCHO Sensor Wiki
• HCHO Sensor manual