With lot number and expiration date clearly marked on the label and an air tight, tamper-proof seal to ensure the quality of the solution, Hanna’s line of pH calibration solutions are an easy way to get great pH measurements every time.

• Air tight bottle with tamper-proof seal for quality.

• Color coded label for easy identification of ph 7 buffer value.

• Perfect for routine maintenance to ensure accurate readings while extending the life of the electrode.