Phosphine detection tube 7J, measuring range 2.5 to 25 ppm 25 to 500 ppm 500 to 1000 ppm, detecting types: ammonia, benzene, carbon monoxide, hydrogen sulfide, sulfur dioxide, hydrogen fluoride, carbon dioxide, chlorine gas, hydrogen chloride, nitrogen oxides, total hydrocarbons, acetone, xylene, butanone, toluene, phosphine, nitrogen dioxide, trichloroethylene, hydrogen cyanide, chloroethylene, thiol, chlorine dioxide, methyl bromide, ozone, butane, gasoline, diesel, formaldehyde