Question: What are the common types of watches?  

Answer: Mechanical watches, quartz watches, smartwatches.  

Question: What is the international standard for mechanical watch accuracy?  

Answer: A daily deviation of ±30 seconds, with slight variations between laboratory tests and actual wear.  

Question: How does a mechanical watch work?  

Answer: It relies on a mainspring to store energy and uses a balance wheel-hairspring system and escapement mechanism for timekeeping, resulting in relatively higher inaccuracy (a daily deviation within ±30 seconds is considered acceptable).  

Question: How does a quartz watch work?  

Answer: It is powered by a battery-driven quartz oscillator, offering minimal deviation (monthly deviation within ±15 seconds).  

Question: How does a smartwatch work?  

Answer: It synchronizes time via internet connectivity, achieving millisecond-level accuracy.  

Question: What precautions should be taken with watches?  

Answer:  

- Anti-magnetic: Avoid placing them near electronic devices like TVs, speakers, phones, or automatic mahjong tables.  

- Shockproof: Prevent strong impacts or contact with corrosive substances such as salt or alkali.  

- Waterproof: Avoid exposure to water or humid environments.  

- Temperature control: Do not expose them to extremely high or low temperatures.