Technical Library - Frequent Asked Questions

Frequent Asked Questions | Glossary

 

1.   

When does a watch’s water resistance need to be checked and what are the levels of water resistance?

2.  

Do watches have shock resistance?

3.

Can a scratch-resistant sapphire crystal be scratched?

4.    
What is the battery life of a quartz watch?

5.   
Do you need to pull out the stem of the watch to preserve a quartz watch battery power?

6.    
Does environmental temperature variation affect a watch’s accuracy?

7.    
Besides temperature, what other factors affect a watch’s accuracy?

8.   
Do you need to wear your mechanical watch every day?

9.   
Does a mechanical watch need to be serviced?

10. 
How regularly must a mechanical watch be serviced?

11.  
What happens to the watch during service?

 

1.      When does a watch’s water resistance need to be checked and what are the levels of water resistance?

Technically, it needs to be checked each time during battery change or servicing. This is because every time the case is opened, the rubber seal that keep water out may be dislodged. Although it is recommended that the watch be sent to the relevant service centre listed in the warranty so that its water resistance can be tested; often this requires longer time and higher cost.

To ensure water tightness, do not touch the crown and push-buttons while under water. For watches with screwed-down crowns, always keep them tight. Rinse your watch after swimming in the sea.

Levels of water resistance are:

Markings

Examples of use

Water resistant

Withstand splashes of water or rain only; do not submerge

3 atm/ 30m/ 100ft

Withstand splashes of water or rain only; do not submerge

5 atm/ 50m/ 165ft

Rain, showering, swimming

10atm/ 100m/ 330ft

Rain, showering, swimming, sailing, snorkeling, recreational diving

20atm/ 200m/ 660ft

Rain, showering, swimming, sailing, snorkeling, recreational diving, surfing, white water rafting

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2.      Do watches have shock resistance?

Besides watches that specify shock resistance, it is recommended that wearers should not subject their watches to hard knocks. Watch movement consists of small parts that may be vulnerable to damage from excessive force. It is important to note that all watches’ warranties do not cover wear and tear and external damages.

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3.      Can a scratch-resistant sapphire crystal be scratched?

Scratch-resistant does not mean “scratch-proof”. Diamond, the hardest natural substance known to man, measures 10 on Moh’s hardness scale. Most scratch-resistant crystals are made of synthetic sapphire, an extremely hard mineral that measures 9 on the same scale. Despite its high rating, materials such as a synthetic stone surface, often found on some furniture or walls, can still cause scratches on sapphire.

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4.      What is the battery life of a quartz watch?

Normally the battery will last 1 – 2 years, depending on the movement type. Watches with multi-features, especially those with illumination, have a tendency to have shorter battery life span.

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5.      Do you need to pull out the stem of the watch to preserve a quartz watch battery power?

The savings is marginal when you consider that battery will lose 5 to 8% of its power a year just being unused. However, for most watches the lubricant in the gear may coagulate after periods of inactivity, and as a result, may not work even with a new battery change.

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6.      Does environmental temperature variation affect a watch’s accuracy?

Deviation from ambient temperature will affect the time accuracy of a quartz watch. Quartz watches, known for their high accuracy due to the steady vibrations of quartz crystals, are made to perform optimally at room temperature. Temperature deviations from ambient will also cause the metal movement parts (both quartz and mechanical watches) to expand and contract, thereby affecting its accuracy.

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7.      Besides temperature, what other factors affect a watch’s accuracy?

A quartz watch is only affected by temperature variation. A typical mechanical watch might gain or lose about 5 - 10 minutes a month, depending on the wearing habits. However, it is possible to adjust a mechanical watch accuracy to fit the wearer’s lifestyle.

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8.      Do you need to wear your mechanical watch every day?

It is recommended that you wind it (usually by rocking the watch in a to-and-fro motion) for a few minutes at least once a week if you do not wear it. This is to prevent the movements’ lubricants from coagulating.

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9.      Does a mechanical watch need to be serviced?

Yes, it needs to be serviced regularly even if it is working fine. A mechanical watch needs to be lubricated regularly to ensure that it continues to run smoothly. Over time, the watch becomes less accurate due to abrasion caused by oil deterioration and friction between the movement parts.

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10.  How regularly must a mechanical watch be serviced?

It is recommended to do so every 3 years or so. When in doubt, refer to the relevant service centre listed in the warranty.

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11.  What happens to the watch during service?

The technician will dismantle the watch, clean its case and bracelet as well as replace worn parts. The watch is then reassembled, lubricated and regulated. If the watch is water resistant, its water resistance is verified.

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