A specimen jar is a container used to store and display biological or other specimens. It is typically made of glass and has a tight-fitting lid to prevent contamination or evaporation. Specimen jars come in various sizes and designs and can be used for a wide range of specimens, including plants, insects, small animals, and fluid specimens.

Some specimen jars are designed to be used for long-term storage, while others are designed for short-term use or display purposes. The jars may be clear or colored, and maybe plain or labeled for identification purposes.

Specimen jars are commonly used in biology, botany, entomology, and other scientific disciplines for storage, transport, and display of specimens. They are also used in museums, schools, and other educational settings for specimen collection and display.