Watch

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A watch was a portable device for keeping time. They were used by humans, Time Lords and other species. 21st century watches required a change of battery every so often, which Jilly Kitzinger often forgot to do. (TV: Rendition)

Uses of watches

The Third Doctor had a watch that could track his TARDIS. (TV: Spearhead from Space)

The Seventh Doctor used a watch to alert him to some imminent danger. (TV: Silver Nemesis)

Both the Tenth Doctor and the War Master used a fob watch to contain their respective Time Lord consciousnesses while they were temporarily made human. (TV: Human Nature / The Family of Blood, Utopia)

References

When he first encountered them, C'rizz called them "clocks around ... wrists", but Charley supplied him with the more precise word, watch. (AUDIO: Time Works)

Early in her travels aboard the TARDIS, Erimem — who came from ancient Egypt where watches had not yet been invented — once expressed shock that Peri could promise to check for the Fifth Doctor's return "every twenty minutes". Peri temporarily traded on her friend's ignorance by suggesting that she had "talent" and a "special device" called "a watch". Being new to the technology, Erimem was genuinely interested in this revelation, but the Fifth Doctor chided Peri by saying that she was "in a very difficult mood". (AUDIO: Nekromanteia)