#242 - disk brake caliper piston retractor tool

http://buy1.snapon.com/catalog/item....re&dir=catalog

Correct.

#243 - looks like it will crimp banding strap??

I don't know if this is a crimper or a stripper. My initial thought was
that it's a crimper but I don't know what it would be used for exactly.

#244 - counter weight for a scale??

Most likely, but hard to say for sure.

#245 - a ruler for drafting. It will have different scales on different
sides.

This answer is correct.

#246 - possibly for truing wheels??

Not sure

#247 - looks like the tool for stretching exhaust doughnuts.

Nope