Which laboratory item is designed for safely handling hot test tubes?

The test tube holder is specifically designed for safely handling hot test tubes. This tool typically has grips that allow you to hold a test tube without direct contact, thereby preventing burns or accidents. It provides a secure method for transporting hot glassware or for holding a test tube during heating or other processes, making it an essential safety tool in a laboratory setting.

In contrast, a test tube rack is primarily used for holding multiple test tubes in an upright position and is not intended for direct handling. A wash bottle is utilized for dispensing distilled water or other solvents, while a thermometer measures temperature but has no role in handling test tubes. Therefore, the test tube holder is the most appropriate choice for safely managing hot test tubes.