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Sand + time = awesome looking watch. This reminds me of the sun dial watches you see on the Flintstones.
Solder:Time II DIY watch kit. $59.95. Great looking laser cut acrylic case. Unique. Just solder it and it's ready! Dallas DS1337+ Real Time Clock (RTC) for super accurate time keeping Jumper for always on use. Hackable: Programming & I2C pads labeled on bottom. Clear front & back casing to show internal electronics. Adjustable wrist band. Long lasting battery, with special LED lighting method & very low power processor sleeping. This is a very easy DIY soldering kit.