Ensure accuracy and confidence in your measurements with our lab grade pH 4.01 calibration buffer solution. The MA9004 is designed for laboratories and professionals who require reliable pH calibration. Regular calibration of your probes is essential for optimal performance and accurate readings. Our solution eliminates the uncertainty of mixing buffers, offering an impressive accuracy of ±0.01 pH. Achieve consistent, repeatable results while extending the life of your pH electrode with Milwaukee’s trusted calibration solutions.

Design Features

• Lab grade pH 4.01 calibration buffer solution (230 mL)
• Essential for precise use of electrodes and achieving the most accurate, reproducible pH measurements
• Tamper proof, air tight cap and sealed against light to ensure solution integrity
• Fast and convenient calibration process
• Simple to use—just pour into a beaker or suitable container and immerse your tester or electrode