The document describes the features and characteristics of the products.
The Hanna Instruments HI 250 and HI 251 are logging microprocessor-based bench meters designed for measuring pH, temperature, and oxidation-reduction potential (ORP). The HI 251 model additionally features a relative mV range. These instruments support one, two, or three-point calibration using five memorized buffers and offer both manual and automatic temperature compensation.
| pH Range | -2.0 to 16.0 pH |
|---|---|
| Temperature Range | -9.9 to 120.0 °C |
| pH Resolution | 0.01 pH |
| pH Accuracy (HI 250) | +/- 0.01 pH @ 20 °C/68 °F |
| mV Range (HI 251) | -699.9 to +2000 mV |
| Input Impedance | > 10^12 ohm |
| Power Supply | 12 VDC adapter |
| Warranty Period | 2 years |
The instruments support one, two, or three-point calibration using five memorized buffers: 4.01, 6.86, 7.01, 9.18, and 10.01 pH.
Temperature can be compensated manually or automatically using the HI 7669/2W temperature probe.
Yes, the instruments can store measured data in memory at the user's request for later retrieval.
HI 250 and HI 251 are guaranteed for two years against defects in workmanship and materials.