| CPC G01L 19/0038 (2013.01) [G01L 19/0672 (2013.01); G01L 19/147 (2013.01)] | 20 Claims |

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1. An apparatus comprising:
a cover assembly having a hook and a first catch, wherein said hook defines a first passage in communication with an exterior of said apparatus;
a gasket mounted on said cover assembly and having (i) a first sealing region, (ii) a second sealing region, and (iii) a second passage in communication with said first passage, said gasket including a plurality of posts configured to extend into corresponding holes in the cover assembly for holding the gasket to the cover assembly; and
a housing assembly having a sealing surface, a second catch, and a first cavity configured to hold a sensor, wherein (i) said sealing surface mates with said first sealing region of said gasket, (ii) said sensor (a) seals to said second sealing region of said gasket and (b) is in communication with said exterior of said apparatus through said first passage and said second passage, and (iii) said first catch of said cover assembly cooperates with said second catch of said housing assembly to lock said cover assembly to said housing assembly.
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