Features:
| Model | PH-220 | PH-221 | PH-320 |
| pH Range | -2.00~16.00pH | -2.000~20.000pH | -2.000~20.000pH |
| pH Accuracy | ±0.01pH | ±0.002pH | ±0.002pH |
| Resolution | 0.01pH | 0.1, 0.01, 0.001pH, Selectable | 0.1, 0.01, 0.001pH, Selectable |
| Calibration Points | 2 points |
1~5 points |
1~5 points |
| Calibration Solutions | USA (pH4.01/7.00/10.01) | USA (pH1.68/4.01/7.00/10.01/12.45), NIST (pH1.68/4.01/6.86/9.18/12.45), DIN (pH1.09/4.65/6.79/9.23/12.75) or User-defined | USA (pH1.68/4.01/7.00/10.01/12.45), NIST (pH1.68/4.01/6.86/9.18/12.45), DIN (pH1.09/4.65/6.79/9.23/12.75) or User-defined |
| Temperature Compensation | 0~100°C, 32~212°F, Manual or Automatic | 0~100°C, 32~212°F, Manual or Automatic | 0~100°C, 32~212°F, Manual or Automatic |
| mV Range | -1999~1999mV | -1999.9~1999.9mV | -1999.9~1999.9mV |
| mV Accuracy | ±1mV | ±0.2mV | ±0.2mV |
| Resolution | 1mV | 0.1, 1mV, Selectable | 0.1, 1mV, Selectable |
| Calibration Points | / | 1 point (Only for Relative mV mode) | 1 point (Only for Relative mV mode) |
| Ion Concentration Range | / | / | 0.001~19999ppm, mg/L, mol/L (Refer to the range of ISE) |
| Ion Concentration Accuracy | / | / | ±0.5% F.S (Monovalent),±1% F.S (Divalent) |
| Calibration Points | / | / | 2~5 points (0.001, 0.01, 0.1, 1, 10, 100, 1000, 10000ppm, mg/L, mol/L) |
| Temperature Range | 0~100°C, 32~212°F | 0~105°C, 32~221°F | / |
| Temperature Accuracy | ±1°C | ±0.5°C,±0.9°F | / |
| Resolution | 0.1°C | / | / |
| Hold Function | Manual | / | / |
| Memory | Stores up to 50 data sets | Stores up to 500 data sets | Stores up to 500 data sets |
| Output | / | USB Communication Interface | USB Communication Interface |
| Connector | BNC | -------- | |
| Power Requirements | 1×9V/800mA battery |
3×1.5V ''AA'' batteries (Standard) or DC5V power adapter (Optional) |
3×1.5V ''AA'' batteries (Standard) or DC5V power adapter (Optional) |
| Dimensions(W*D*H) | 185*88*32mm | 170*85*30mm | |
| Package Size(W*D*H) | 475*155*350mm | ||
| Net Weight | 300g | ||
| Gross weight | 2kg | ||
