Spartna SPR-714 it can measure Dust Particle Detector, Oxygen (O2), Hydrogen sulfide (H2S), Carbon monoxide (CO) detection, Methane (CH4) air temperature & relative humidity. It has many functions. With it is possible to determine the number of particles in the size of 0.3, 1.0, 2.5 and 10 µm. It is the ideal instrument for environmental safety and energy-saving surveys.