NIST traceable pH buffers and calibration kits for accurate, repeatable meter calibration.

Biopharm pH buffer reference solutions give your lab a dependable starting point for every pH measurement. Each solution is traceable to NIST standard reference materials and color-coded for fast, error-free identification at the bench.

Choose the format that fits your workflow. Shop Individual Buffer Solutions when you need a single pH value or a specific replacement, or shop pH Calibration Kits when you want matched buffers bundled for two-point or three-point calibration.

All buffers are packaged in 500 mL (1.06 pint) bottles, made in the USA, and intended for laboratory use.

Shop by format:

  • Individual Buffer Solutions: single-value buffers from pH 4.00 to pH 10.00, sold individually.
  • pH Calibration Kits: pre-matched buffer sets for two-point and three-point calibration.

Frequently Asked Questions

Have questions about our laboratory products or ordering process? We've answered some of the most common questions to help you find the information you need quickly.

What is a pH buffer solution used for?

pH buffers are used to calibrate pH meters and electrodes so measurements stay accurate and repeatable over time.

Which buffers do I need to calibrate my meter?

Most meters use a two-point calibration (pH 7.00 paired with pH 4.00 or pH 10.00) or a three-point calibration across the full range. Match your buffers to the range you measure most often.

Are Biopharm pH buffers NIST traceable?

Yes. Every solution is traceable to NIST standard reference materials.

How should I store pH buffers?

Keep bottles tightly capped at room temperature and do not pour used solution back into the bottle.