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 |
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*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 |