A few tips for the Condenser Valve. Its primary use is in giving you better tactical choices about where you'll be when a Peril Event hits; you can move through several rooms, and then spend the Oxygen (and so move past the Peril Event's trigger).
It also allows greater movement when you're at your Last Gasp. The valve allows you to move X spaces and then spend X Oxygen in a single transaction; you therefore only have to discard once for a large move.
As you've identified, with the addition of rolling for extra oxygen expenditure, the condenser valve becomes even more useful!
Tool Page Number. Thanks catching the typo! I'll get that corrected in the next digital update :)
The Spectromagnetic Camera fills up a room's track while you're exploring, essentially investigating it for you while you go move elsewhere, e.g. to explore or investigate a different room. You will need to go back to the room to benefit from any Milestones it unlocks.
You could use it to essentially double the speed of your investigation in a single room, spending 1 Oxygen to Investigate and then adding 1 Tick from the Camera, e.g. to brute-force your way into the Vault.
Room Tracks don't reset during a Wreck, so you can't keep unlocking the same Milestones by walking in and out of a room.
We'll work on a more explicit version of this phrasing for the next edition. Perhaps something like:
DISCARD. Mark your current Room. When you spend any Oxygen, add an equal amount of ticks to this Room's Investigation Track. If you leave this Room, you can only benefit from an unlocked Milestone once you have returned to this Room.