| Specification | |||
| Model | HM-20P | RM-20P | HM-21P |
| Range | pH: 0.00 ~ 14.00 | ORP: 0 ~ +/-1999mV | pH: 0.00 ~ 14.00 |
| Repeatability | +/-0.02 pH | +/-2mV | pH: +/-0.02 pH ORP: +/-2mV |
| Calibration | Up to 3 points | ..... | Up to 3 points for pH |
| Temperater Range | 0 ~ 99°C | ||
| TemperatureRepeatability | +/-0.2°C | ||
| Data Storage | 300 data | ||
| Power | 2 x AA Batteries | 2 x AA Batteries or AC Adaptor | |
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