The pH 4.01 buffer in a 1000 ml bottle is the most commonly used buffer solution.

pH 4.01 is ideal for those requiring an accurate neutral reading, particularly those working in water purification plants, the food industry, aquatics, and Hydroponics, and wherever the pH is expected to be neutral. The latest Hanna portable and bench microprocessor instruments are calibrated with pH 4.01.

Buffer solutions should be stored at 25◦C, away from direct sunlight for accurate readings.

To correctly maintain your meter/electrode, we highly recommend the use of a Hanna cleaning solution, as well as a buffer, for maximum performance every time. pH4 can also be used as an emergency storage solution.

Hanna buffer solutions are prepared, ready-to-use, according to precise formulas and standardized in accordance with the National Institute of Standards and Technology (NIST) to ensure quality and accuracy. All solutions show a batch number, an expiry date, and the correlation table between pH and temperature. A certificate of analysis is available on request. All bottled solutions are sealed with an airtight, tamper-proof seal to prevent any Carbon Dioxide from entering and causing a change in the pH buffer value.

Browse the Hanna complete range of solutions

• pH buffer solutions
• Standard solutions for conductivity, Total Dissolved Solids (TDS), turbidity, salinity and Ion-Selective Electrode (ISE) calibration
• Oxidation-Reduction Potential (ORP) test and pre-treatment solutions
• Reference fill solutions for refillable electrodes
• General and specific cleaning solutions for electrodes
• Solutions for electrode maintenance and storage
• Solutions for sample preparation

Solutions are available in many sizes ranging from 20ml sachets for small users to 3.78L (1 gallon) containers for large quantity usage in laboratories.

For safety and traceability, all Hanna solutions are provided with a label showing the batch number and expiry date. A certificate of analysis is available on request in line with NIST standards. Click for Details