Product Overview

Our pH 4.00 Calibration Buffer is a NIST-traceable acidic standard formulated for precise pH meter and electrode calibration. With a certified value of pH 4.00 ± 0.01 at 25 °C, this buffer is ideal for low-end calibration points, particularly in acidic testing environments such as food quality control, environmental sampling, and biochemical analysis.

The solution is color-coded red for clear visual distinction during multi-point calibrations, helping prevent cross-contamination and ensuring procedural accuracy. It is stable, accurate, and manufactured with high-purity components and deionized water under strict quality controls.

Key Features:

• Certified pH 4.00 ± 0.01 at 25 °C
• NIST-traceable formulation for audit-ready compliance
• Red color allows quick identification and avoids mix-ups
• Available in 500 mL, 1 L, 3.8 L, and 20 L volumes
• Packaged in HDPE bottles with tamper-evident seals for lab security

Recommended Use:

• Ideal for calibrating pH meters used in acidic ranges (e.g., fermentation, soil, and beverages)
• Commonly used alongside pH 7.00 (yellow) and pH 10.00 (blue) buffers—also available—to complete three-point calibration
• Rinse electrodes with deionized water between buffer steps to maintain precision

P1001 – pH 4.00 Calibration Buffer delivers acidic calibration accuracy, visual clarity, and regulatory confidence, making it a dependable solution for routine pH monitoring in research and industry.