What is an "adjusted" watch?

If a watch has been "adjusted," it is a sign of quality. An adjusted movement has been tuned to keep accurate time under various positions and conditions. Medium grade watches usually are adjusted to 3 positions (dial up, dial down, pendant up). After 1908, all railroad pocket watches were required to be adjusted to at least 5 positions (dial up, dial down, pendant up, pendant left, pendant right). Watches can also be adjusted to temperature and isochronism, which was common in premium watches.