- HANNA®' buffer solutions are prepared according to precise formulas and are standardized with a pH meter calibrated according to the NIST standards.
- The 20 mL sachets are single-dose whereas, for more demanding applications, you may choose between packages of 230 mL, 500 mL, 1 Liter or 1 Gallon (3.78 L).
- All pH 4 solutions show batch number, expiration date and the correlation table between pH and temperature. HI 5004, HI 6004, HI 7004L/C, HI 8004L/C and HI 70004C are supplied complete with certificate of analysis.
- This buffer value is widely used in water purification plants, in the food industry and where ever the pH is expected to be slightly acidic.