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JIS water-proof standards
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The most widely recognized standard for water-proofness is the JIS (Japanese Industrial Standards). Many manufacturers will list their products as being water-proof then give you the protection degree in JIS 0-8. Here are the JIS classifications.
JIS 0 - Without protection
JIS 1 - Drip Proof - Having no harmful influence by dripping of water falling perpendicularly.
JIS 2 - Drip Proof - Having no harmful influence by dripping of water falling from the range covering 15 degrees from perpendicular.
JIS 3 - Spray Proof - Having no harmful influence by rainfall covering the range of 60 degrees from perpendicular.
JIS 4 - Splash Proof - Having no harmful influence by receiving splash of water from any direction.
JIS 5 - Jet Proof - Having no harmful influence by receiving direct jet of water from any direction.
JIS 6 - Watertight - Having no ingress of water into inside by receiving direct jet of water from any direction.
JIS 7 - Immersion Proof - Having no ingress of water into inside when immersed in water under specified conditions.
JIS 8 - Submersible - Always usable when submerged in water of specified pressure.
This is word for word per JIS. Keep in mind that this standard is used for many types of products. Most high end binoculars are JIS 7 or 8 but some low end optics can claim water-proof and only be JIS 1.
Edited by Chris Farris - April/08/2009 at 09:14
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