- Durable glass test tubes with heat-resistant glass and a robust plastic cap for long life and secure sealing. Clear glass provides easy content observation and simple labeling. - Four capacities to fit your workflow: 10 ml, 15 ml, 20 ml, 30 ml. Choose the size that matches sample volume, reagents, or standards. - Leak-resistant design: caps seal tightly to prevent spills, contamination, and evaporation during storage and transport. - Travel and storage versatility: ideal for liquids, medications, samples, essential oils, or small treat items; compact and easy to carry with a reliable lid. - Practical benefits: reduces sample loss, supports accurate measurement and handling, and is reusable after proper cleaning; designed for standard laboratory routines. - Use scenarios - In the lab: aliquotting samples, storing reagents, or preparing standards for experiments. - In the field: collecting and transporting liquid samples or on-site measurements. - In classrooms or home: demonstrations, experiments, or safe storage of medicines and essential oils.