12 Pack Class A Graduated Color Comparison Tubes with Glass Stoppers, 10ml 25ml 50ml 100ml, Borosilicate Glass Laboratory, Water Testing & Chemical Analysis (25ml,Transparent)

Our Class A Graduated Color Comparison Tubes are essential tools for colorimetric analysis in environmental testing, water quality monitoring, and educational laboratories. Designed with precision and durability in mind, they allow for direct sample preparation, dilution, and optical comparison within a single vessel. Key Features:Material: High-quality, low-expansion borosilicate glass.Calibration: Class A tolerance, calibrated "to contain" (TC) at 20°C.Graduations: Permanent full-volume scale for clear visibility.Stopper: Precision-ground glass stopper included for each tube.Sizes: 10ml, 25ml, 50ml, 100ml.Clarity: Available in clear glass.Primary Applications:Standard methods for water and wastewater analysis (e.g., determination of chlorine, ammonia, phosphate).Chemical oxygen demand (COD) tests and other colorimetric assays.Sample preparation and visual comparison in quality control labs.Educational demonstrations in chemistry and environmental science courses.

• High-Precision Class A Standard: Manufactured to meet stringent Class A volumetric tolerances, ensuring accuracy and reliability for quantitative colorimetric analysis
• Complete Set of Practical Sizes: Includes the most commonly used capacities: 10ml, 25ml, 50ml, and 100ml. The uniform outer diameter allows them to fit standard colorimeter.
• Clear Full-Volume Graduations: Features permanent, fired-on ceramic or enamel graduations from the bottom to the top (full scale), facilitating accurate dilutions and volume measurements directly in the tube.
• Ground Glass Stopper for Secure Sealing: Each tube comes with a matching ground glass stopper to provide an airtight seal, preventing evaporation and contamination during mixing or storage.
• Durable & Chemically Resistant: Made from high-quality borosilicate glass, offering excellent resistance to thermal shock and most chemicals, suitable for heating and various lab environments.