| Model | PH-981 |
| Range | 0.00~14.00PH |
| Resolution | 0.01 pH |
| Accuracy | ±0.05pH |
| Calibration | 1point |
| A T C | 0 to |
| Power | 4×1.5v alkaline |
| Dimensions | 170×33× |
| Weight | |
| ● ATC ● Low battalear ● Waterproot ● Hold | |
| Model | PH-281 |
| Range | 0.00~14.00PH |
| Resolution | 0.01 pH |
| Accuracy | ±0.05pH |
| Calibration | 1 point |
| A T C | 0 to |
| Power | 4×1.5v(LR44) |
| Dimensions | 172×26× |
| Weight | |
| ● ATC ● Replacement electrode ● Low battalear ● Waterproot ● Hold | |
| Model | PH-281A | PH-281B |
| Range | 0.00~14.00PH | |
| Resolution | 0.01 pH | |
| Accuracy | ±0.1pH | |
| Calibration | 1 point | |
| A T C | 0 to | |
| Plug | BNC + | BNC |
| Power | 4×1.5v (LR44) | |
| Dimensions | 135×26× | |
| Weight | | |


















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