Test tube baskets are laboratory containers used to hold test tubes securely during various procedures, such as mixing, heating, or cooling. They are typically made of metal or plastic and have an open wire or mesh design that allows for easy access to the tubes while also keeping them in place.

Some test-tube baskets are designed to hold a specific number of tubes, while others are adjustable to accommodate different numbers or sizes of tubes. The baskets often have a handle for easy handling, and some may have a lid for added protection of the tubes and their contents. They are commonly used in chemical and biological laboratories for various types of sample preparation and storage.