I have a breathalizer at home that I bought from Amazon. Check the reviews to find one that is accurate. They come with multiple mouth pieces so everyone can share in the fun : )
Seriously, it's a hoot and also responsible to let everyone take a test if you're having company at home or on the water.
I've found that Rusty's chart is very accurate and you'd be surprised at some of the readings. Many smaller women will blow .05-.08 after two glasses of wine in some cases. I blew .06 after 4 beers and a meal one afternoon but definitely would not drive a boat or anything else.
I find it very useful because some people have a high tolerance for alcohol and can be over the limit without realizing. You just might save someone from a DWI or worse if you have one around for company.
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