| Project |          The peference model  Performance   parameters     | MEWOI 11+ | MEWOI 14+ | MEWOI 15+ | 
| Source | DC millivolt | Range | -10 ~ 1100mV | -10.000~100.000mV  | -10 ~ 1100mV | 
Accuracy=    ±(% of the set value+% of range) | 0.02%+0.01% | 0.02%+0.01% | 0.02%+0.01% | 
| Resolution | 1uV | 1uV | 0.01mV | 
| DC voltage | Range | -1 ~ 11V | -0.1 ~ 1V | -1 ~ 11V | 
Accuracy=     ±(% of the set value+% of range) | 0.02%+0.01% | 0.02%+0.01% | 0.02%+0.01% | 
| Resolution | 0.1mV | 10uV | 0.1mV | 
| DC current | Range | 0 ~ 22mA | N/A | 0 ~ 22mA | 
Accuracy=    ±(% of the set value+% of range) | 0.02%+0.02% | 0.02%+0.02% | 
| Resolution | 1uA | 1uA | 
| Sink current | Range | 0 ~ 22mA | N/A | 0 ~ 22mA | 
Accuracy    ±(% of the set value+% of range) | 0.02%+0.02% | 0.02%+0.02% | 
| Resolution | 1uA | 1uA | 
| External power supply | 5 ~ 28V | 5 ~ 28V | 
| Resistance | Range | 0 ~ 40KΩ | 0 ~ 4KΩ | N/A | 
Accuracy=    ±(% of the set value+% of range) | 0.02%+0.02% | 0.02%+0.02% | 
| Resolution | 0.01Ω/0.1Ω/1Ω | 0.01Ω/0.1Ω | 
| Frequency | Range | 1Hz ~100KHz | N/A | 1Hz ~10KHz | 
| Accuracy   | ±2words | ±2words | 
| Resolution | 0.01Hz/1Hz/0.1KHz/2KHz | 0.01Hz/1Hz/0.1KHz/2KHz | 
| Pulse | Frequency | 1Hz ~10KHz | N/A | 1Hz ~10KHz | 
| Range | 1 ~100000cyc | 1 ~100000cyc | 
| Accuracy   | ±2words | ±2words | 
| Resolution | 1cyc | 1cyc | 
| Switch | Range | 1Hz ~100KHz | N/A | N/A | 
| Accuracy   | ±2words | 
| Resolution | 0.01Hz/1Hz/0.1KHz/2KHz | 
| Thermocouple | Range | 10types(R/S/K/E/J/T/B/N/L/U) | 10types(R/S/K/E/J/T/B/N/L/U) | N/A | 
| Accuracy | 0.4℃ | 0.4℃ | 
| Resolution | 0.1℃/1℃ | 0.1℃/1℃ | 
| RTD | Range | 6types(Pt100/Pt200/Pt500/  Pt1000/Cu10/Cu50) | 6types(Pt100/Pt200/Pt500/  Pt1000/Cu10/Cu50) | N/A | 
| Accuracy | 0.2℃ | 0.2℃ | 
| Resolution | 0.1℃ | 0.1℃ | 
| Measure | DC millivolt | Range | N/A | -5 ~ 550mV | -20 ~ 220mV | 
Accuracy=  ±( % of Reading+ % of Range) | 0.02%+0.01% | 0.02%+0.02% | 
| Resolution | 1uV/10uV | 0.01mV | 
DC voltage   | Range | N/A | N/A | -5 ~ 55V | 
Accuracy=  ±( % of Reading+ % of Range) | 0.02%+0.01% | 
| Resolution | 0.1mV/1mV | 
| DC current | Range | N/A | N/A | -4 ~ 55mA | 
Accuracy=  ±( % of Reading+ % of Range) | 0.02%+0.01% | 
| Resolution | 1uA | 
| Resistance | Range | N/A | 0 ~ 5.5KΩ | N/A | 
Accuracy=  ±( % of Reading+ % of Range) | 0.05%+0.02% | 
| Resolution | 0.01Ω/0.1Ω | 
Frequency   | Range | N/A | N/A | 3 ~50KHz | 
| Accuracy | ±2words | 
| Resolution | 0.01Hz/0.1Hz/1Hz | 
| Switch | Range | N/A | N/A | CLOSE/OPEN | 
| Threshold | 200 ~300Ω | 
| Pressure | Range | N/A | N/A | Depends on the pressure module | 
Accuracy=  ±( % of Reading+ % of Range) | Depends on the pressure module | 
| Resolution | 5 digit display | 
| Loop power supply | Range | N/A | N/A | 24V | 
| Accuracy | ±10% | 
| The maximum current | 22mA | 
| Thermocouple | Range | N/A | 10types(R/S/K/E/J/T/B/N/L/U) | N/A | 
| Accuracy | 0.7℃ | 
| Resolution | 0.1℃/1℃ | 
| RTD | Range | N/A | 6types(Pt100/Pt200/Pt500/  Pt1000/Cu10/Cu50) | N/A | 
| Accuracy | 0.5℃ | 
| Resolution | 0.1℃ | 
| Continuity beeper | Range | N/A | 0 ~500Ω | 
  | 
| Accuracy | ≤50Ω Sound | ≤250Ω  Sound | 
| Resolution | 0.01Ω | 
  | 
| Other functions | Backlight | √ | √ | √ | 
| Auto Power-off | √ | √ | √ | 
| Charging function | √ | √ | √ | 
| Room temperature display | √ | √ | √ | 
| Battery detection | √ | √ | √ | 
| Communication function | RS232 serial communication, can realize remote control instrument by the device driver software | 
| The mathematical treatment | Data hold、zero、average | Data hold、zero、average | Data hold、zero、average | 
| Characteristic | 
| Safety | EN61010-1:2001 | EN61010-1:2001 | EN61010-1:2001 | 
| Insulation | DC500V /50MΩ | DC500V /50MΩ | DC500V /50MΩ | 
| EMC | EN61326-1:2006 | EN61326-1:2006 | EN61326-1:2006 | 
| Authentication | CE | CE | CE | 
| Display | Double display on the LCD screen | Double display on the LCD screen | Double display on the LCD screen | 
| Power supply | 4×1.5V  AAA alkaline battery | 4×1.5V  AAA  Alkaline battery | 4×1.5V  AAA   Alkaline battery | 
| Size | 205 × 95 × 42 mm | 205 × 95 × 42 mm | 205 × 95 × 42 mm | 
| Weight | About 500g | About 500g | About 500g | 
| Standard Quantity Per Carton | 10pcs | 10pcs | 10pcs | 
| Standard Carton Measurement | 395mm*385mm*260mm | 395mm*385mm*260mm | 395mm*385mm*260mm | 
| Standard Carton Cross Weight | 10.4Kg | 10.3Kg | 11.5Kg |