Understand the waterproof level of watches

認識手錶防水等級 - HOURGLASS WATCH STORE

What is the waterproof rating of the watch?

The waterproof level is usually marked with Water Resistant or Water Proof in English on the watch dial or watch cover, and a waterproof level mark such as 5ATM/BAR, M or 10ATM/BAR/M will be added next to the watch cover. If not, If marked above, it means that the watch is not waterproof.

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What does M mean in the ATM/BAR waterproof rating?
• ATM/BAR: stands for Standard Atmospheric Pressure. In stagnant and dirty water, 1 standard atmospheric pressure is equal to 10 meters.
• M: Refers to water resistance in meters in stagnant and dirty water.
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Sweat Resistant
Prevent sweat from penetrating into the watch when wearing it. It is not recommended for people who sweat a lot.
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3ATM/3BAR, 30M
Life waterproofing only has the most basic water-repellent function, which can prevent sweat, rain and water splashes from penetrating into the watch. However, it cannot be worn while bathing or swimming, nor can the watch be rinsed directly under water.
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5ATM/5BAR, 50M
It has a water-repellent function, which can prevent sweat, rain and water splashes from penetrating into the watch. It can also be used for short showers/withstand heavy rain. It is no problem to wash and clean it under water. However, it cannot be worn during water activities such as swimming, nor can it be worn for long periods of time. Soak in water.
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10ATM/10BAR, 100M
Take a shower and cope with rainy days easily. Can be carried out
Light water activities such as swimming are allowed, but diving activities are not allowed.
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20ATM/20BAR, 200M
Suitable for any water activities, but the diving depth cannot exceed 200 meters.
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30ATM/30BAR, 300M
Suitable for any water activities, but the diving depth cannot exceed 300 meters.
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50ATM/50BAR, 500M
Suitable for any water activities, but the diving depth cannot exceed 500 meters.
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Things to note about waterproof watches:
No matter what kind of waterproof watch it is, all waterproof watches may be damaged when taking a hot bath, soaking in a hot spring, or being exposed to high temperatures. Because waterproof watches only protect against cold water but not hot water, hot water will produce water vapor. The molecules of water vapor are smaller than liquid water, so water vapor can easily penetrate into the watch and easily cause malfunction.
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1. Avoid washing the watch directly with hot water or high pressure

2. You cannot adjust the time or operate the buttons in water (unless the watch case is specially designed)

3. Cleaners such as soap or alcohol will accelerate the aging of the parts of the waterproof watch.

4. Don’t wear leather watches while swimming.

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