Hanna Instruments HI7004 Hanna HI7004 pH buffer 4.01 @ 25°C, 500 mL. NIST-traceable, color-coded red. Approvals: NIST-traceable (buffers + standards).
| Part | HI7004 |
| Method | Phthalate buffer |
| Range | 4.01 pH @ 25°C |
| Accuracy | ±0.01 |
| Shelf life | 12-24 months unopened |
| Storage | 15-25°C, dark |
| MOQ | 1 |