–Replaced hearing batteries around 10 AM (5.5 days).
–Played with cameras. Spent hours looking into Leica ME issues. Thought it was a failed sensor, but eventually noted it was replaced in 2015 with a sensor that (allegedly) would not go bad. Much later, I checked out rangefinder calibration at infinity. Seems to be quite off, if the light I was focusing on was really at infinity. Will try to calibrate tomorrow, when it’s warmer outside. I always want something “new” of course, but the M9s on eBay are pretty sketchy.