SM207 Portable Formaldehyde (CH2O) Gas Detector Meter Indoor Air Quality sensor Tester SM207 Formaldehyde Detector Meter uses electrochemical gas sensors and precision humidity sensor. It could detect the concentration of formaldehyde gas and air humidity. Small size, light weight, easy to carry(Inch: 7.87*4.13*2.17), responsive, strong anti-jamming capability, digital display concentration, could use at any time on-site monitor. It is widely used in interior decoration, decoration materials, chemicals, environmental monitoring and industries to detect the current humidity and gas concentration formaldehyde in the environment.