Are these tubes 40ul?

They are standard capillary tubes

Is it the 'receptacle' that has one open end or the tubes themselves that each have an open end? Or is it both??

The tubes themselves have only one open end and the the vial they come in has a hole in the top

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Labs - 100 Pack Borosilicate Glass Capillary Melting Tubes, 4" Long, 0.05" OD - High-Temperature Resistant, Chemical-Resistant Melting Point Tubes with Easy Dispensing Container

Product ID: 21374489

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🔥High-temp resistant

🔬100 tubes

🧪Borosilicate glass

Description

🔍 Discover Precision in Every Melt!

THERMAL RESILIENCE - Withstands extreme temperatures up to 820°C.
UNMATCHED DURABILITY - Chemical-resistant and built to last through rigorous testing.
CONVENIENT DISPENSING - Easy access with a one-at-a-time dispensing container.
PRECISION ENGINEERING - 100 borosilicate glass tubes for accurate melting point determination.
VERSATILE APPLICATIONS - Ideal for labs, research, and educational settings.

EISCOLabs offers a pack of 100 high-quality borosilicate glass capillary melting tubes, each measuring 4 inches in length and 0.05 inches in outer diameter. Designed for accurate melting point determination, these tubes are packaged in a user-friendly dispensing container, ensuring easy access and storage. Their exceptional durability and chemical resistance make them perfect for a variety of laboratory applications, while their ability to withstand high temperatures and thermal shocks ensures reliable performance in any setting.

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