Bw Company recently developed a model.

Hand-held gas detection alarm. Bw Company recently developed a hand-held gas detection alarm. BW portable oxygen detector replaces sensor GAXTXDL, which is a hand-held gas detection alarm developed and produced by BW Company in Canada. It is highly waterproof, shockproof and subminiature. It can be used to detect the amount of ambient gas, and the acousto-optic vibration alarm function can be displayed at any time when the gas content is too high or too low.