| Measurement method | pH | Glass electrode method |
| ORP | Platinum electrode method |
| Conductivity | AC 2-Electrode Method |
| DO | Optical |
| Temperature | Thermistor resistor |
| Display unit | Custom LCD with backlight |
| Measurement Item/Range | pH | pH0.000～pH14.000 |
| mV(ORP) | -2000～2000mV |
| Conductivity | 0.1mS/m～10S/m |
| Resistivity | 0.1 Ω•m to 10kΩ•m (converted from Conductivity) |
Salinity (NaCl, PSSs: Practical Salinity)
TDS (total dissolved solid) | Conversion from Conductivity |
| DO/Saturation | 0.00～20.00mg/L or 0.0 to 200.0% |
| Temperature | 0.0～100.0℃ When using DO probes: 0.0 to 50.0℃ |
| Display Range | pH | pH-2.000～pH16.000 |
| mV(ORP) | -2200～2200mV |
| Conductivity (manual/automatic range switching) | 0.000～2.000mS/m (0.00～20.00μS/cm) |
| 0.00～20.00mS/m (0.0～200.0μS/cm) |
| 0.0～200.0mS/m (0.000～2.000mS/cm) |
| 0.000～2.000S/m (0.00～20.00mS/cm) |
| 0.00～20.00S/m (0.0～200.0mS/cm) |
| Switchable between SI unit (S/m) and old unit (S/cm) |
| Resistivity (manual/automatic range switching) | 0.005～2.000 Ω･m (0.5～200.0Ω･cm) |
| 0.00～20.00 Ω･m (0.000～2.000kΩ･cm) |
| 0.0～200.0 Ω･m (0.00～20.00kΩ･cm) |
| 0.000～2.000 kΩ･m (0.0～200.0kΩ･cm) |
| 0.00～20.00 kΩ･m (0.000～2.000MΩ･cm) |
| 0.0～200.0 kΩ･m (0.00～20.00MΩ･cm) |
| 0.000～2.000 MΩ･m (0.0～200.0MΩ･cm) |
| Switchable between SI unit (Ω•m) and old unit (Ω•cm) |
| Salinity | 0.00～4.04%(NaCl) 0.00～42.40psu(PSS) |
| TDS (total dissolved solid) (manual/automatic range switching) | 0～99.99/ 999.9 mg/L |
| 0～9.999/ 99.99/ 999.9 g/L |
| DO/Saturation | 0.00～22.00mg/L or 0.0 to 220.0% |
| Temperature | -5.0～110.0℃ When using DO probes:-5.0 to 55.0℃ |
| Repeatability (instrument body) | pH | ±0.006pH |
| mV(ORP) | ±2mV |
| Conductivity/Resistivity Salinity/TDS (total dissolved solid) | ±0.5% FS |
| DO/Saturation | When combined with 8 mg/L±0.1mg/L or 100%±1%
* MM4-DDO |
| Temperature | Within ±0.2℃ |
| pH Temperature Compensation Range | ATC (Automatic Temperature Compensation): 0 to 100.0℃
MTC (manual Temperature Compensation): 0 to 100.0℃ |
| Conductivity Temperature Compensation scope | ATC (Automatic Temperature Compensation): 0 to 100.0℃
MTC (manual Temperature Compensation): 0 to 100.0℃
OFF (no Temperature Compensation) |
| Conductivity Standard Temperature Setting | Fixed at 25℃ |
| Conductivity Temperature Coefficient (Linear) | 0～10.00%/℃ |
| DO Temperature Compensation range | ATC (Automatic Temperature Compensation): 0 to 50.0℃ |
| pH calibration | JIS pH standard solution, US standard solution up to 5-point calibration or custom-made standard solution up to 2-point calibration |
| Temperature Calibration | One-point calibration |
| Performance Guaranteed Temperature, Humidity | 0 to 45℃ 20 to 90% (non-condensing)
* 0 to 40℃ when the optional External Printer is used |
| Waterproof structure | IP67(1m, immersion allowed for 30 minutes)
* Disabled when probes are not connected |
| Data Memory | MM-42DP: each ch 1500 data (measurement times, measurement values, Temperature) |
| (When Data Memory is operated, the measured data of ch1 and ch2 are memorized simultaneously.) MM-41DP: 1500 data (measured time, measured value, Temperature) |
| Calibration History Creation Function | Main unit side: Last 1 time |
| Probe side: pH is 10 batches including the newest, and DO is 8 batches including the newest. |
| Interval Measurement function ※1 | Setting interval: 1 second to 99 minutes 59 seconds or 5 minutes to 99 hours 59 minutes can be arbitrarily set. |
| Print Function | Can be connected to optional External Printer EPS-P30 (Plain Paper Print) |
| Auto Hold Function | Stable judgment value: Fixed |
| Auto Power Off | OFF/10 min./30 min./60 min./180 min./360 min./720 min. settable |
| USB (peripheral, Micro) | 1 port standerd equipment (isolated) |
| Analog output (insulate)※2 | pH | pH0～14 → 500～1900mV |
| mV(ORP) | -2000～2000mV → 200～2200mV |
| Conductivity/Resistivity | Each range 0～FS(2000 digit)→ 200～2200 mV |
| Salinity (NaCl equivalent) | 0.00～4.00% → 200～2200mV |
| Salinity (PSS-78 equivalent) | 0.00～40.00psu → 200～2200mV |
| TDS | Each range 0～FS(9999 digit)→ 200～2200 mV |
| DO | 0.00～20.00mg/L → 200～2200mV |
| Saturation | 0～200% → 200～2200mV |
| Temperature | 0～100℃ → 200～2200mV |
| Power supply | AA batteries/rechargeable nickel-metal hydride batteries 2 pcs or USB-powered (no recharging function) ※2 |
| Battery life (estimate) | When a pH or ORP probe is connected: Approx.800 hours When a Conductivity probe is connected: Approx. 500 hours When an optical DO probe is connected: Approx. 60 hours ※2 |
|
| ＊Backlight turns off, option not connected |
| Power consumption | 0.2VA (with battery 3V), 0.9VA (with USB-powered) |
| Dimensions (projections not included) | Approx. 70 (W) × 35 (H) × 185 (D) mm |
| Main Unit Weight (including batteries) | MM-42DP: Approx. 300g MM-41DP: Approx. 290g |
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