| Model | PHS-25CW | PHS-3CW | PHS-3BW | |
| pH | ||||
| Range | 0.00~14.00pH | 0.00~14.00pH | 0.00~14.00pH | |
| Accuracy | ±0.05pH | ±0.01pH | ±0.01pH | |
| Calibration point | 2 points(pH4.00/6.86/9.18) | |||
| mV | ||||
| Range | ±1999mV | ±1999mV | ±1999mV | |
| Accuracy | 10mV | 1mV | 1mV | |
| Temperature | ||||
| Range | — | — | 0 ~100°C | |
| Accuracy | — | — | ±1°C | |
| Other | ||||
| Temperature compensation range | 0~100°C, by hand | 0~100°C, by hand | 0~100°C, Auto | |
| Connect | BNC | |||
| Display | LCD display screen | |||
| Power | DC9V Adapter | |||
| Dimension | 210×205×75mm | |||
| Weight | 1.5kg |