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How do I tell the difference between a .5 diamter nozzle and a .7 diameter nozzle? I ordered one of each and can;t tell them apart. I don;t want to wait to go to work and use a pin gage. Is there an easy household way to tell?

I noticed the hex shoulder width is slightly different, is that a design feature to tell them apart?

find a .5 or .7 diameter drill bit

I got it. Found some wire and it went through the bigger one and not the smaller.

These are small metric drill bits that I use to identify nozzles and possibly clean them.
http://www.amazon.com/SE-Drill-Mini-Siz ... +drill+bit