| Specifications | ||
| Product Type | pH Meter | |
| Meter style | Portable | |
| Range (pH) | -2.00 to 16.00 | |
| Range (mV) | ±1600 mV; ±1999 relative mV | |
| Range (Temperature °C) | -5 to 105 | |
| Range (Temperature °F) | 23 to 221 | |
| Resolution (pH) | 0.1/0.01 | |
| Resolution (Temperature) | 0.1 | |
| Resolution (mV) | 0.1/1 | |
| Accuracy (pH) | ±0.01 pH | |
| Accuracy (Temperature) | ±0.1°C | |
| Accuracy (mV) | ±0.2 mV or 0.05%, whichever is greater | |
| Accuracy (Dissolved Oxygen) | ±0.3 mg/L | |
| Temperature compensation | Automatic or manual | |
| Display | LCD | |
| Interface | USB or RS232 | |
| Calibration | Up to 3 points | |
| Waterproof | Yes | |
| Qty/ea | 1 | |
| Buffer recognition | USA, NIST, DIN | |
| Power | Four AA batteries (included), optional universal AC adapter | |
| Datalogging (points) | 50 | |
| CE Compliance | Yes | |
| Brand | Thermo Scientific Orion | |
| Dimensions (" W) | 4.25 | |
| Dimensions (" H) | 9.125 | |
| Dimensions (" D) | 2.375 | |
| Model | STAR A121 | |
