• A test tube with a rim, measuring 12×75 mm, is a cylindrical glass tube used for holding, mixing, and heating small quantities of substances, such as chemicals, biological samples, or other materials.

– Dimensions: 12 mm diameter x 75 mm length
– Material: Borosilicate glass or soda-lime glass
– Rim: A reinforced lip at the top of the tube for secure sealing with a stopper or cork
– Gradations: May have graduated markings for measuring volumes
– Capacity: Approximately 5-6 ml

• Uses:
  1. Laboratory testing: For conducting chemical reactions, heating, and mixing substances.
  2. Sample storage: For storing small quantities of biological samples, such as blood, urine, or tissue.
  3. Mixing and dilution: For preparing small quantities of solutions, dilutions, and mixtures.
  4. Heating and boiling: For heating substances, boiling, or sterilizing equipment.
  5. Education and training: For teaching laboratory techniques, chemistry, and biology.
  6. Research and development: For experimentation, quality control, and analysis in various industries.

These small test tubes are ideal for applications requiring minimal volumes, providing a safe and convenient way to handle and manipulate substances in laboratories, educational institutions, and research facilities.