PYREX® 50 mL Nessler cylinders (also known as Nessler tubes) are specialized borosilicate glass instruments used for colorimetric analysis, such as visual color comparison of water samples.

Key Specifications

• Precision Design: Manufactured with an optically plane base for maximum clarity during visual comparisons.
• Material: Made from high-quality borosilicate glass, selected specifically for its freedom from color or visible defects to ensure accurate testing.
• Graduation: Typically features permanent white enamel markings at the 50 mL level (and sometimes 25 mL) for precise volume measurement.
• Standardization: Often sold in matched pairs to ensure uniformity across samples during color comparisons.