Egg or balls?

 Let me start this post with an image:

The other day, I went with D to his doctor's appointment.  Everything was routine, not horribly exciting.  But then the doctor pulled out a large wooden beaded necklace with a number on each bead (except hers was all green) like the one above from a large pocket on her white lab coat and starts fingering the beads as if they were rosary.  I asked her what it was for.  She said she was going to use the beads to determine what stage of puberty D was in.  This made absolutely no sense to me.  I said to her, isn't there variation in ball size like height?  She mumbled something unintelligible, but proceeded to (and relying on her words, as he was under the covers, so I couldn't see) compare the size of his testicle to the numbered beads on her necklace.  I thought the whole thing made no sense, first the necklace is quite bulky and heavy, she has to carry this around all day?  (It doesn't work for girls, they have another test, but we didn't get into what that test is.)  When comparing the patient's testicles to the necklace, isn't she bound to make contact with either the patient's body or balls?  I didn't see her sanitize the necklace before or after.  D says she didn't make any contact with him, but I don't find him trustworthy and in logically thinking about how hard it would be not to make any contact when you are comparing two objects next to each other, it just doesn't seem to hygienically work for me.  So she would have to very carefully hold the bead she's using to compare next to his testicles, close but not too close that they touch, while also being careful of the other beads' positions (they would naturally droop if she held just one bead in her hand), so that they too don't make any contact.  Not to mention, is she going to hit the jackpot the first time or is she going to have to do a few tries with different beads?  And is there variation between testicles, does she have to mentally compute the average between the two balls? I feel like you need a computer and at least three hands to do this exam without making any contact!

Lastly, I noticed the beads were egg/oval shaped.  Thai people call testicles eggs, not balls, and I think that's more accurate.  Just like the Thai sound for how a rooster crows is way more realistic than cock-a-doodle-doo.  Americans just don't do justice to cock and balls.  

And if you're Josh, you are wondering if the largest size, #25 corresponds accurately to your balls.  But I think if you reach #25, you are determined to be sexually mature or the inventors of this game think there's no point in measuring beyond #25.  Regardless,  I don't think reaching #25 precludes one from getting larger or longer balls.