TVOC/eCO2 mini Unit is a digital multi-pixel gas sensor unit with integrated SGP30. It mainly measures various VOC (volatile organic compounds) and H2 in the air. It can be programmed to detect TVOC (total volatile organic compounds) and eCO2 (equivalent carbon dioxide reading)Concentration measurement. Typical measurement accuracy is 15% within the measurement range, the SGP30 reading is internally calibrated and output, which can maintain long-term stability. SGP30 uses I2C protocol communication with on-chip humidity compensation function, which can be turned on through an external humidity sensor. If you need to obtain accurate results, you need to calibrate according to a known measurement source. SGP30 has a built-in calibration function. In addition, eCO2 is calculated based on the concentration of H2 and cannot completely replace "true" CO2 sensors for laboratory use. Features: TVOC/eCO2 concentration detection I2C communication(0x58) Outstanding long-term stability Humidity Compensation 2x LEGO-Compatible Hole HY2.0 4P interface Application Air quality monitoring eCO2 concentration Specifications: Measurement range: Ethanol: 0-1000ppm, H2: 0-1000ppm, TVOC: 0-60000 ppb, eCO2: 400-60000 ppm TVOC and eCO2 sampling rate: 1Hz TVOC and eCO2 sampling accuracy: TVOC: 1/6/32bbp, eCO2: 1/3/9/31ppm Communication protocol: I2C: 0x58 Color: White Material: PC Package Contents: 1x TVOC/eCO2 Mini Unit 1x HY2.0 Cable 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.