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Our pH 4.00 Buffer Solution is a NIST-traceable calibration standard formulated for accurate calibration of pH meters operating in the acidic range. With a certified value of pH 4.00 ±0.01 at 25 °C, this buffer delivers reliable, repeatable performance for laboratory, industrial, and field use.
This buffer is commonly used alongside pH 7.00 for two-point calibration, ensuring accuracy across low-pH measurements.
Nominal Value: pH 4.00
Accuracy: ±0.01 at 25 °C
Traceability: NIST-traceable
Documentation: Certificate of Analysis (COA) available
Grade: Laboratory / Industrial Calibration Standard
To ensure calibration integrity:
Pour buffer into a clean, dedicated container
Do not return used or unused buffer to the original bottle
Keep container tightly sealed when not in use
Always follow the expiration date printed on the label
Routine calibration using fresh buffer helps extend probe life and improves measurement confidence.
All of our buffers and reagents are manufactured in Hanover, Pennsylvania, using carefully controlled processes focused on quality and consistency.
Starting materials are typically ACS grade
Certificates of Analysis available for all testing reagents
NIST traceability for calibration solutions
Induction-sealed caps protect against leaks and contamination
Packaged and shipped by certified in-house professionals in accordance with HM-126F Dangerous Goods Regulations
The pH 4.00 Buffer Solution is widely used in:
Drinking Water & Wastewater Treatment
Food & Beverage Processing
Aquaculture
Agriculture & Fertigation
Chemical Manufacturing
Environmental & Stormwater Monitoring
Clinical & Research Laboratories
✔ High-accuracy acidic pH calibration
✔ NIST-traceable confidence
✔ Made in the USA
✔ Secure, leak-resistant packaging
Cannon Water Technology Inc.
Cannon Water Technology Inc.
HM Digital
Cannon Water Technology Inc.
Myron L
