Professional Portable pH/ORP Meter
221 Portable pH/ORP Meter
Professional portable pH meter with relative mV measurement mode, 1 to 5 points calibration, setup menu contains 9 optional parameters, accuracy 0.002pH.
pH Mode:
• Professional portable pH meter is equipped with a backlit LCD display.
• 1 to 5 points push-button calibration with auto-buffer recognition.
• Selectable pH buffer group (USA/NIST/DIN) or using the custom calibration solutions.
• Automatic electrode diagnosis with pH slope and offset display.
• Automatic Temperature Compensation ensures accurate readings over the entire range.
• Calibration Due Alarm prompts user to calibrate the meter regularly.
ORP Mode:
• 1 point offset calibration allows adjusting the displayed value to a known standard.
• Relative and absolute millivolt modes provide the reliable ORP measurements.
Other Features:
• Stability indicator shows when a measurement is recognized as stable.
• Auto-Read feature senses and locks the measurement endpoint.
• Battery indicator shows the remaining battery capacity.
• Auto-Power Off effectively conserves battery life.
• Setup menu allows setting the 9 parameters, including the number of calibration points,
resolution, stability criteria, date and time, etc.
• Reset feature automatically resumes all settings back to factory default options.
• Expanded memory stores and recalls up to 500 data sets.
• Stored readings can be transferred into the computer by USB communication interface.
• Multi-mode power scheme (batteries, power adapter or USB port) ensures that use the
meter smoothly.
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Model |
221 |
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pH |
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Range |
-2.000~20.000pH |
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Accuracy |
±0.002pH |
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Resolution |
0.1, 0.01, 0.001pH, selectable |
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Calibration Points |
1 to 5 points |
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pH Buffer Options |
USA, NIST, DIN or Custom |
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mV |
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Range |
±1999.9mV |
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Accuracy |
±0.2mV |
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Resolution |
0.1, 1mV, selectable |
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Calibration Points |
1 point |
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Measurement Modes |
Relative or Absolute mV |
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Temperature |
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Range |
0~105°C, 32~221°F |
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Accuracy |
±0.5°C |
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Resolution |
0.1°C, 0.1°F |
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Calibration Points |
1 point |
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Calibration Range |
Measured value ±10°C |
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General |
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Temperature Compensation |
0~100°C, 32~212°F, Manual or Automatic |
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Data Hold |
Manual or Auto-Endpoint |
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Stability Criteria |
Low or High |
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Calibration Due Alarm |
1 to 31 days or Off |
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Power Off |
Manual or Automatic (10, 20, 30 minutes) |
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Reset Function |
Yes |
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Memory |
Stores up to 500 data sets |
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Output |
USB communication interface |
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Connector |
BNC |
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Display |
LCD |
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Power |
3×1.5V AA batteries or DC5V power adapter |
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Battery Life |
Approximately 150 hours (Turn off the backlit) |
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Dimensions |
170(L)×85(W)×30(H)mm |
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Weight |
300g |
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Order Code |
Accessories |
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221-CN |
E201-BNC pH electrode |
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TP-10K temperature probe |
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pH buffer solutions (pH4.01/7.00/10.01) |
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Carrying case |
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221-UK |
P11 glass pH electrode |
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TP-10K temperature probe |
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pH buffer solutions (pH4.01/7.00/10.01) |
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Carrying case |
| Items | Description |
| P11 pH Electrode | Suitable for the general applications |
| P12 pH Electrode | Suitable for the sample in the test tube |
| P13 pH Electrode | Suitable for the micro-volume samples |
| P15 pH Electrode | Suitable for the low conductivity samples |
| P16 pH Electrode | Suitable for the Tris buffers |
| P18 pH Electrode | Suitable for the slurries and soils |
| P19 pH Electrode | Suitable for the semisolids |
| P21 pH Electrode | Suitable for the colloids |
| P22 pH Electrode | Suitable for the high temperature samples |
| 501 ORP Electrode | Suitable for the sample with strong redox potential |
| 502 ORP Electrode | Suitable for the sample with weak redox potential |
| TP-10K Temperature Probe | Special-purpose temperature sensor |
| pH Buffer Solutions | 480mL/bottle |
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Order Code |
Carton Dimensions (L×W×H) |
Weight |
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221-CN |
340×290×80mm |
1.5kg |
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221-UK |
340×290×80mm |
1.5kg |
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