this is incorrect, the sensors are mounted in the sensor carriage, it is mounted to 4 pins that are screwed into the head. The sensor carriage is seperated from the head with an o ring, which further insulates it from the head, which is exposed to ambient water. There is condensation in the area of the sensor carriage, but from what I have seen, much less than say an Inspio, but there is usually lots of condensation in the bottom of the plenum. (again the plenum on a meg is the can, or bucket as yall prism divers call it), the first real point of condensation is the aluminum plenum, which always has drops on it after a dive, as well as in the bottom moisture pads.

there is a moisture pad in the sensor carriage, made of chamois material that gets moist after the dive, and after several hours can be wrung out. The one way valve in the sensor carriage was removed when ISC realised that most divers were not checking its function properly, even though its on the pre dive checklist. When units would come in for servicing, most every one would fail the one way valve check due to crud collecting in the flapper. It also was realised that it wasnt doing anything that the chamois couldnt.