For measuring, I have a much simpler method assuming you have reasonable flexibility.

Get a tape measure (a flexible fabric or paper one), and lie on your back on the floor. Flip your legs into the air (towards your head) and feel around for your sit bones. When you locate them, measure them with the tape measure holding it with your thumbs marking the location of each bone. Then, without letting go, put your legs through your arms so that you can veiw the tape measure in front of you. Voila!

My sit bone measurement is 133. When I sat on the butt-o-meter, all they told me was that I needed a Specialized 143 saddle. No other information, which wasn't very helpful when looking at other brands! I tend to favor men's saddles. So far, I've been successfully using the Terry Fly, but because of the padding, it does get softer over time and needs replacing. Luckily, as far as saddles go, it's not that expensive. I need to replace it about every 3000 miles or so. I may have an extra one lying around, and if so, I'd be happy to let you try it out. I'm still searching for the perfect saddle which for me would pretty much be a Fly with minimal padding.