Building construction:In building construction, catalytic combustion gas sensors can be used to monitor the safety of underground gas pipelines. Environmental monitoring:Can be used to detect toxic and harmful gases in the air, providing data support for environmental protection. School research:In school research, catalytic combustion gas sensors can be used to study the properties and changes of combustible gases. type:NAP-55S Colour:Blue Material:plastic Package Contents: 1 x Catalytic combustion sensor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.