Witschi Proofmaster S leak test instrument for seal integrity verification.
A federally approved term to indicate the amount of pressure a watch can withstand under water without leaking or losing accuracy.
Water Tightness is achieved by installing seals between major parts of the watch case and a specially designed setting crown which, together, prevent moisture from entering the case.
Not a permanent condition
In order to maintain the integrity of this water resistant system, periodic maintenance is required.
Gaskets between the case back, setting crown, & crystal deteriorate over time under normal use as they are subject to many aggression's; perspiration, dust, cosmetics, temperature changes, ultraviolet rays, chlorine or salt water, etc. leaving your watch vulnerable to moisture damage.
Therefore these parts must be inspected periodically and replaced as necessary. In addition, water-resistant watches must be tested to ensure a proper seal has been re-established.
Water resistance and depth are not the same.
Consideration must be given to the additional pressures caused during many water based activities which involve movement & other environmental changes that may defeat the water protection features of water resistant watches.
These exceptions include the following:
- *Sudden, rapid, & repeated water pressure changes experienced by the wrist of a surface swimmer.
- The force of plunging your arm into the water while swimming can for a fraction of a second greatly exceed the static pressures the watch was designed for.
- *High water temperatures as experienced in a hot tub can damage the seals.
- Sudden temperature change from 100 degree F of a hot tub to 70 degree F of a pool causes contraction of the case and seals at different rates which may allow water to leak in.
Furthermore, impacts to the crown or chrono pushers can influence the water-resistance as well.
The water resistance of watches is measured by laboratory pressure test that are comparable
to a swimmer or diver “at rest” at that level of pressure.
The different levels of water resistance as expressed are only theoretical.
Look for resistance levels printed on the dial or case back of the watch. An absence of any indication indicates extra caution is necessary to avoid contact with moisture. This is common with expensive "dress" watches.
|NO DECLARATION||This model is NOT water resistant.
Any water contact should be avoided.
|WATER RESIST||This model is resistant to minor and Accidental Splashes.
Greater water contact should be avoided
|WATER RESISTANT 30M
(3 ATM / 100 Feet) *
|Protected in everyday life, accidental splashes, or car washing - it is resistant against perspiration, water vapor, rain drops. It is tested for water resistance up to 3 ATM, and must be able to survive 30 minutes under water at a depth of 1 m (3 feet) followed by 90 seconds under a pressure corresponding to 30 meters|
|WATER RESISTANT 50M
(5 ATM / 160 Feet)*
|Suitable for surface swimming but not snorkling or other water sporst. It is tested for water resistance up to 5 ATM corresponding to 50 meters|
|WATER RESISTANT 100M
(10 ATM / 300 Feet) *
|Suitable for swimming, snorkeling,and water sports. No high board diving or sub aqua diving. It is tested for water resistance up to 10 ATM corresponding to 100 m|
|WATER RESISTANT 200M
(20 ATM / 660 Feet) *
|Suitable for high impact water sports free diving without scuba gear. It is tested for water resistance up to 20 ATM corresponding to 200 m|
|WATER RESISTANT 300M
(30 ATM / 1000 Feet) *
|Protected for scuba diving to a depth of 30 meters, for 2 hours. It is tested for water resistance up to 30 ATM corresponding to 300 m|
|WATER RESISTANT 500M
(50 ATM / 1650 Feet) *
|Protected for scuba diving to a depth of 50 meters, for 2 hours. It is tested for water resistance up to 50 ATM corresponding to 500 m|
*The metres (m) value does not relate to a diving depth but to the air pressure used in the course of the water resistance test.
Micro processor based measurement system.
Leakage rate is always referred back to the ISO 2281 Standard.
An unquestionable result is obtained.