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MB3 111a: Shatnez, Fly Swatters, Brooms, Telescopes and Watches on Shabbos (308:46-52)
Is a shatnez garment muktzah on Shabbos? Is chametz considered muktzah?
A fly swatter is a כלי שמלאכתו לאיסור and can be used to get rid of flies (but not to kill them). Today where our floors are paved, our brooms are not muktzah. Using a telescope (astrolabe) on Shabbos. An hourglass, sundial, and watch on Shabbos.
Using a smartwatch or a watch with a calculator on Shabbos.