In a pinch you can use the scales people use to weigh food. Digital is best, but analog will give you a general idea. Normal people scales generally won't measure small enough. All of our local wal-marts carry the food scales in their cooking sections. Any cooking store shoudl have them too, though I would call first, especially in the weather we are having! (I live in Indiana and we are having the same cold wet weather)
Another option is if you have a sibling still in high school, particularly taking physics, they can borrow a scale that will work. There are scales that they use to measure the force of friction and things like that. They are small and have hooks on the end of a spring. If you create a little pouch out of a handkerchief and hook that onto that type of scale that should work too. You can buy them fairly inexpensively, though I am not sure where from without ordering them online. A sporting goods store maybe? since they are often used to measure the weight of caught fish...? I think I would check wal-mart first though for the food scales. 
Also, just as a general point of knowledge, Betadine should not be taken internally.
I just mention it since we had been talking about it before. I have never used Baytril, but if hydration is a problem you may want to consider soaking him, though making sure the water is warm enough, and that he stays really warm when drying so he doesn't get a chill.
Good luck with everything! Thank you for keeping us posted!
Elizabeth
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1.0 Uro Archimedes
0.0 Fish
0.1 Sulcata Minnie
1.1 Iguanas Flik and Loki
0.1 Newfoundland Jasmine
0.1 Feline Winter
Indiana & Wisconsin