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Pat, I wish you a fast recovery.!
I don't know the differences between the calibers. The one I suggest is the one that was recommended to me and I love using it. Over the years I have learned to invest in good quality supplies and it is of utmost importance that your measurements don't shift as you begin to work.
With this caliber you take one end and measure lets say the height of the models head. Then you take the other end and adjust the settings until it corresponds with the size that you want the head to be on the canvas. Since I am awful at math, I just keep adjusting both ends until I have it right, but for those not mathematicaly challenged there is a probably a formula. Once you get the right size figured out you tighten the screw and voila all your measurements will correspond.
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