No Rocket Surgeon
Join Date: Jan 2005
Location: Corona and S. El Monte, CA
Bikes: Cannondale D600, Dahon Speed T7
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I can't see what that other button does, but I think I can guess...
Some have a zero feature, so you can set zero anywhere on the scale.
If it's important, be sure you get standard or metric. One of them (on ebaY) has both scales, the other only has metric (I thought 16.68 looked a bit off on that second one. I'm used to reading in inches!) Some calipers can switch, but the markings on the scale will be off. Maybe that's why the first on has two buttons...and two scales.
I personally prefer dial calipers. It's much easier for me to pre-set them to a specific measurement.
Hope this helps!
Fewer Cars, more handlebars!