orchidometer

To relate the size of your testicle to the Tanner stage of development:
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Stage 1: (childhood): 1 to 3 milliliters
Stage 2: (early adolescence): 4 to 6 milliliters
Stage 3: (mid adolescence): 7 to 16 milliliters
Stage 4: (late adolescence): 12 to 24 milliliters
Stage 5: (adulthood): 16 to 27 milliliters