Weems and Plath Endurance 125 Clock - Manual (Page 15)

The moveable pointer at the center of the glass crystal should be set to
the present atmospheric pressure. This will allow you to return to the
barometer after some time has passed, and determine if the atmospheric
pressure is on the “Rise” or “Fall”.
Barometer Troubleshooting
Black needle will A . Wait for a few days, in case the
not move pressure is steady.
B. Place barometer in a clear, plastic bag
trapping air inside with the barometer. Hold
opening of bag closed and push on bag
which should create air pressure causing
the needle to move. If the needle does not
move, call Customer Service 1-800-638-0428.
Needle showing A. Adjust the slot head screw in the back
incorrect reading of the movement, turning either left or right to
bring the needle to the correct reading. Never
turn this screw more than one rotation.
B. Call Customer Service at 1-800-638-0428.