This fancy little doohickey is honestly one of my favorite fishy accessories. It was about $20 but I can’t tell you how many test tube spills it has saved me from! Plus’s there are holes in the bottom so you can flip your clean tubes upside down to dry and it pops right on top of the API saltwater testing kit box. No regrets! 😍 https://www.aquameta.ca/products/api-master-test-kit-tube-holder-and-drying-rack