Air Quality Sensor MQ135 (Analog/Digital) Soldering Iron Tip The chip pin leads

The chip pin leads

If the color is found on the 3rd band for a 4-band type or the 4th band for a 5-band and 6-band type

Fixed Hole Diameter (below bearing wheel): 3

simple to use AT command ie

Air Quality Sensor MQ135 (Analog/Digital) Soldering Iron Tip The chip pin leadsIntroduction: Sensitive for benzene, alcohol, smoke Output voltage boosts along with the concentration of the measured gases increases Fast response and recovery Adjustable sensitivity Signal output indicator Warning: please use this sensor only in controlled experiments. Flammable gases and fumes are very dangerous. Features: Both types of output (Analog and Digital) Compact size sensor so that it can use in any environment. Runs for a lifetime