| 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 Coe?cient (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 O? |
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 o?, 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 |
