Allen,
 
I bought one (brand Bresser, price 40 euros) to look at Varroa family groups and count offspring. 
 
It works perfectly for its price. However, the field of vision that you can take a picture of, is small. I have to manipulate the mites, lay them close to eachother to take a family picture. 
 
Takes too much time for hundreds of pupae. What I do is identify and count the offspring developmental stages with a normal binocular at 20X that shows everything in a square inch and take reference pictures with the USB-microscope. 
 
The USB is easily good enough to look at damage to varroa or tracheal mites at higher magnification but the small field of vision hinders easy manipulation. 
 
atb
Lennard  
  		 	   		  
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