| model | ZDR-3 | |
| pH/pX measurement unit | ||
| pH/pX level | Grade 0.001 | |
| mV | scope | (-2000.00 ~ 2000.00) mV |
| Minimum resolution | 0.01 mV | |
| Indication error of electronic unit | ± 0.03% or ± 0.1 mV | |
| pH | scope | (-2.000 ~ 20.000) pH |
| Minimum resolution | 0.001 pH | |
| Indication error of electronic unit | ± 0. 002 pH | |
| pX | scope | (-2.000 ~ 20.000) pX |
| Minimum resolution | 0.001 pX | |
| Indication error of electronic unit | PXI: ± 0. 002 pX, pXII: ± 0. 005 pX | |
| Ion concentration | scope | (1.000 e-9 ~ 9.999 e+9), optional units μg/L, mg/L, g/L, mol/L, mmol/L, ppm, ppb |
| Minimum resolution | 4 significant digits | |
| Indication error of electronic unit | ±0.3% | |
| Temperature | scope | (-10.0~135.0)℃ |
| Minimum resolution | 0.1℃ | |
| Indication error of electronic unit | ±0.1℃ | |
| Instrument indication error | ± 0. 3 ℃ (0.0 ℃ ~ 60.0 ℃), ± 1. 0 ℃ (other ranges) | |
| Two-ring conductivity measuring unit | ||
| Conductivity level | Grade 0.5 | |
| Electrical conductivity | scope | 0.000 μS/cm ~ 3000mS/cm |
| Minimum resolution | 0.001 μS/cm, automatically switching according to range | |
| Electronic unit reference error | ± 0.5% (FS) | |
| Resistivity | scope | 5.00 Ω · cm ~ 100.0 MΩ · cm |
| Minimum resolution | 0.01 Ω · cm, automatic switching according to measuring range | |
| Electronic unit reference error | ± 0.5% (FS) | |
| TDS | scope | 0.000 mg/L ~ 1000g/L |
| Minimum resolution | 0.001 mg/L, automatically switching according to range | |
| Electronic unit reference error | ± 0.5% (FS) | |
| Salinity | scope | (0.00~8.00)% |
| Minimum resolution | 0.01% | |
| Electronic unit reference error | ±0.1% | |
| Four-ring conductivity measuring unit | ||
| Conductivity level | Grade 1.5 | |
| Electrical conductivity | scope | 50.0 μS/cm ~ 3000mS/cm |
| Minimum resolution | 0.001 μS/cm, automatically switching according to range | |
| Electronic unit reference error | ± 1.5% (FS) | |
| Resistivity | scope | 5.00 Ω · cm ~ 20.0 kΩ · cm |
| Minimum resolution | 0.01 Ω · cm, automatic switching according to measuring range | |
| Electronic unit reference error | ± 1.5% (FS) | |
| TDS | scope | 25.0 mg/L ~ 1000g/L |
| Minimum resolution | 0.001 mg/L, automatically switching according to range | |
| Electronic unit reference error | ± 1.5% (FS) | |
| Salinity | scope | (0.00~8.00)% |
| Minimum resolution | 0.01% | |
| Electronic unit reference error | ±0.2% | |
| Dissolved oxygen measurement unit | ||
| Dissolved oxygen | scope | (0.00 ~ 20.00) mg/L |
| Minimum resolution | 0.01 mg/L | |
| Indication error of electronic unit | ± 0. 10 mg/L | |
| Instrument indication error | ± 0. 30 mg/L | |
| Saturation degree | scope | (0.0~200.0)% |
| Minimum resolution | 0.10% | |
| Indication error of electronic unit | ±2.0% | |
| Instrument indication error | ±10.0% | |