I had my EZM13 submerged in my pressure tester at 6 ATM for about 45 minutes. Removed it, warmed it with a hair dryer, and then put some ice water on the crystal. There was condensation under the water droplet, but it dissipated quickly once I wiped it dry.
The copper sulfate capsule is still a very pale blue, about the same as it's always been.
Should there have been any condensation at all if my seals are intact? By comparison, I performed the same test with my Seiko PADI turtle and had no condensation at all.