Clipper lengths

Just a funny question here: does anyone know of a website or have a picture reference of how long *visually* the standard grades 1-8 leave hair?  I can easily estimate a length, but I find it hard to translate that to hair.  For example I can know how wide half an inch is looking at a reel of ribbon (I work in a craft shop...), but if I read thats how long the nape of a pob was it seems insanely short.  Or trying to work out what a particular grade would look like on my fiance, if I was avoiding any see-throughness.  What point does that become an issue?
I was just wondering if there was a source that showed these lengths, maybe a manufacturer would display it?  I remember seeing something similar sometime ago but can't for the life of me remember where.  Cheers  in advance for any help

There are a couple things to consider.  Grades 1 to 8 represent what fraction of an inch the guard is.  Grade 1 is 1/8th inch, 2 is 1/4th inch and so on up to grade 8 for one inch.  The type of clipper also can make a big difference.  Typically, unless the clippers are "barbershop" quality (or zero overlap), you can add 1/8th of an inch to each guard.  For how short to go without seeing through, that also depends on hair color and thickness.  You can always start with an 8 guard, and work your way down.  I have medium texture hair, and I don't "see through" to my scalp until I go shorter than 1/4th of an inch, or a #2 guard.  I would look at www.wahl.com or www.oster.com.  Both websites can be very helpful.

Thanks for the help ssj.  I understand the fractionsy thing, but I find it hard to relate it to a head!  I don't know why.  I'm quite sure I know a lot more about very long hair than very short though.
I liked how the oster link showed kitcheny  stuff first.  I thought it was the wrong company at first haha

enfys,