For Smaller Measurements...

"Show your inner geek with this miniature test tube necklace. All lined up and ready to use, these little test tubes are waiting in a wooden rack.

The wooden rack is 1 1/2 inches across, and the silver plated chain is 23 inches long, with a lobster clasp.

This necklace comes in a gift bag."

Found at TemporalFlux's Etsy shop.