Country City Supported Worked USA Elizabeth, NJ✓ ✓ USA Buffalo, NY✓ ✓ USA Ft.
Lauderdale, FL✓ ✓ Sweden Stockholm ✓ ✓ Finland Helsinki ✓ ✓ Russia Estonia
Germany Warnermunde ✓ ✓ Germany Berlin ✓ ✓ Denmark
The shuttlecock humidifier is an inexpensive way to keep shuttlecocks at optimal
humidity. ($5!)
Research:
* Wilson Patent: https://patents.google.com/patent/US7591369 - ~50% Relative