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| Function | PHS-3CB | PHS-3CU |
| Big LCD screen | Yes | Yes |
| Automatic recognition of 3 kinds of standard buffer solution (4.00pH, 6.86pH, 9.18pH) | Yes | Yes |
| 3 points calibration, manual and automatic temperature compensation | Yes | Yes |
| Measure pH, temperature, mV (ORP) | Yes | Yes |
| E-201-C type pH combined electrode | Yes | Yes |
| USB interface and REX data acquisition software | NO | YES |
| Model | PHS-3CB | PHS-3CU | |
| Level | 0.01 | 0.01 | |
| Measuring Range | pH | (-2.00~19.99)pH | (-2.00~19.99)pH |
| mV | (0~±1999)mV | (0~±1999)mV | |
| Temperature | (0.0~80.0)℃ | (0.0~80.0)℃ | |
| Resolution | pH | 0.01pH | 0.01pH |
| mV | ±1mV | ±1mV | |
| Temperature | 0.1℃ | 0.1℃ | |
| Basic Tolerance | pH | 0.01pH | 0.01pH |
| mV | ±1mV±1digit | ±1mV±1digit | |
| Temperature | ±0.1℃ | ±0.1℃ | |
| Electronic unit input resistance | Not less than 1X1012Ω | Not less than 1X1012Ω | |
| Electronic unit input current | Not less than 1X1012A | Not less than 1X1012A | |
| Stability | (±0.05pH±1 digit)/3h | (±0.05pH±1 digit)/3h | |
| Temperature compensation range | Manual (0.0~80.0)℃ | Manual (0.0~80.0)℃ | |
| Power source | Digital: DC (12V, 10A) | Digital: DC (12V, 10A) | |
| Size (mm) | 290 X 210 X 95 | 290 X 210 X 95 | |
| Net. weight | 1.5kg | 1.5kg | |
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