1. With a signal output indicator light. 2. Dual signal output (analog output and TTL level output). 3. The effective signal of TTL output is low level. (The signal light lights up when the output is low level, and it can be connected to the IO port of the single - chip microcomputer). 4. The analog output increases with the increase of concentration. The higher the concentration Y, the higher the output value. 5. It has relatively high sensitivity to... (The detection concentration range is 10PPB - 2PPM). 6. Dimensions: 32mm (length) × 22mm (width) × 27mm (height). 7. Main chips: LM393, - 131 sensor. 8. Operating voltage: DC 5V. 9. It has a relatively long service life and certain stability. 10. It has a relatively fast response speed and other characteristics. 11. It is equipped with mounting holes for relatively easy fixed installation. 12. The probe is pluggable for relatively easy testing. 13. Applications: Used in detection equipment for home and atmospheric environments. 14. Materials: Plastic, metal. 15. Color: Blue. 16. Packaging contents: 1 sensor module. 17. Only the above packaging contents are included, and no other products are included. 18. Note: Light and different monitors may cause the color of the item to be slightly different from the actual object. The allowable measurement error is ±1 - 3 cm.