I visited the wonderful Brooklyn Flea yesterday and came across this orchidometer from the 1960s. The one we used back in my pediatric training was wood. It even came with a handy leather carrying case! So, of course I had to add it to my growing collection of medical antiquities.

orchidometer  or·chi·dom·e·ter (ôr’kĭ-dŏm’ĭ-tər):

a medical instrument used to measure the volume of the testicles to track testicular development in children