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.