| Photo | Model NO. | For use | Type | Tager gaess | Detection Range | Features |
 | NAP-78S | Commercial | Catalytic | H2.CO | [1/2 H2 + CO](0.03-2%) | For gas water heater, oil water heater, boiler |
 | NAP-131A | Commercial | Catalytic | methane, | 5 - 25%LEL | For hydrogen fuel cell |
 | NAP-131AF | Commercial | Catalytic | methane, | 5 - 25%LEL | For hydrogen fuel cell |