-- Last Updated: Jan-30-14 7:48 PM EST --
Waterproof means exactly that - no intrusion !
The testing standard of IEC 529 level 7
is designated "IPX7" and is equivalent to JIS 7.
Basically designates equipment can survive
immersion for 30 minutes at a depth of 1 meter.
The classification of IPX7 is for temporary
(i.e. accidental) immersion in water.
It is not for continuous underwater use.
IEC 529 (European Community Specification)
or International Electrotechnical Commission
and JIS2-8 (Japanese Industry Standard)
have graduated test levels of #2 - #8
Salt water - marine usage - is a very harsh world
Michigan has fresh water, we are a bit lucky
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