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| Function | DDS-307 | DDS-11A |
| Big LCD screen | Yes | Yes |
| 3 points calibration, manual and automatic temperature compensation | Yes | Yes |
| Manual temperature compensation | Yes | Yes |
| Automatic temperature compensation | Yes | No |
| Measure conductivity,TDS and temperature (ORP) | Yes | Yes |
| With our E-201-C type pH combined electrode | Yes | Yes |
| Model No. | DDS-307 | DDS-11A | |
| Level | 1.0 | 1.5 | |
| Measuring range | Conductivity | 0.00μS/cm-199.9mS/cm | 0.00μS/cm-199.9mS/cm |
| TDS | 0.00mg/L-1999mg/L | – | |
| Temperature | (0.0-60.0)℃ | (0.0-60.0)℃ | |
| Basic error of electronic unit | Conductivity | ±1.0%（FS） | ±1.0%（FS） |
| TDS | ±1.0%（FS） | – | |
| Temperature | ±0.4℃ | ±0.4℃ | |
| Basic error of instrument | Conductivity | ±1.5%（FS） | ±2.0%（FS） |
| Temperature | ±0.6℃ | ±0.4℃ | |
| Normal working temperature | Environment temperature | （0.0-40.0）℃ | （0.0-40.0）℃ |
| Relative humidity | ≤85% | ≤85% | |
| Power supply | AC（220±22）V （50±l）HZ | AC（220±22）V （50±l）HZ | |
| No external magnetic field interference， except earth’s magnetic field | No external magnetic field interference， except earth’s magnetic field | ||
| Outline dimension（mm） | 280×200×80 | 280×200×80 | |
| Weight | 1.5kg | 1.5kg | |
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