Every pH reading starts with a buffer you can rely on. Thermal Scientific stocks pH buffer solutions for lab and field calibration, including color-coded pH 4.0, 7.0, and 10.0 reference buffers, with NIST-traceable options from Aqua Solutions and a deep selection from LabChem and Ricca Chemical. Choose by pH value, container size, and shelf life, and keep your most-used sizes stocked through our Vendor Managed Inventory program.
Calibrating a meter? Browse our pH meters and portable pH and conductivity meters, then round out your calibration kit with conductivity standards and ORP calibration standards. See the full range of buffers, standards, and calibration solutions.
Most labs calibrate with two or three buffers that bracket the expected sample pH, commonly pH 4.0, 7.0, and 10.0.
Color coding helps you identify values at a glance. Our Aqua Solutions reference buffers use yellow for pH 7.0, red for pH 4.0, and blue for pH 10.0.
Select Aqua Solutions buffer references are traceable to NIST. Check the product listing for traceability details, or contact our team for documentation.
