The clock at The Burrow

The The Weasley's Cloak is a magical cloak that lives in the kitchen at The Burrow. It has only one hand and no numbers at all. Written around the edges of it are things like Time to make tea, Time to feed the chickens and You're late. It is propebly used by Mrs Weasley to keep track of chores and what she is doing. There is also a clock that monotors the well fair of the rest of the Weasley family. During Voldemort's second rein, all the hands pointed at Mortal Peril all the time.

Behind the Scenes
In Harry Potter and the Chamber of Secrets (film) the clock has little moving pictures of all the Weasley's family on hands (Fred and George share one) and the hands would point to things like; Home, School, and Mortal Danger.