In the past few years, we have covered plenty of ferrofluid toys here. The Ferrofluid Desk Clock is also worth a look. It has hour and minute hands made with magnetic liquid that are held in place with magnets. It comes with 5 different clock faces for you to choose from. You can also interact with the clock using magnets.
You may also want to see:
FERROFLUID Magnetic Liquid Clock by MTR Designs -- Gadgetify
This clock comes with a hand crushed aluminum face. It runs for a year on a single AA battery.
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