3Jan/100
Casio Digital Watch SECRET Display test screen [example HDD-600]
This video shows you how to enter the Secret Display test mode in a Casio HDD-600 watch. Works with most Casio digital watches. May not work on some old watches.
30Dec/090
Casio Digital Watch (HDD-600) Display Test Mode
Shows how to enter the display test mode in Casio Digital Watches. Some watches, especially old watches may not have this feature. The watch used here is a Casio HDD-600 (Module No. 2889)