| Project |                             Model   Performance parameters | MEWOI 24 | MEWOI 25 | 
| Source | DC millivolt | Range | -10 ~ 110mV | -10 ~ 110mV | 
Accuracy=  ±(% of the set value+% of range) | 0.02%+0.01% | 0.02%+0.01% | 
| Resolution | 1uV | 1uV | 
| DC voltage | Range | -0.1 ~ 11V | -0.1 ~ 11V | 
Accuracy=  ±(% of the set value+% of range)
  | 0.02%+0.01% | 0.02%+0.01% | 
| Resolution | 10uV/0.1mV | 10uV/0.1mV | 
| DC current | Range | 0 ~ 22mA | 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 | 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 ~40KΩ | 
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/1Ω | 
| Thermocouple | Range | R/S/K/E/J/T/B/N | R/S/K/E/J/T/B/N | 
| Accuracy | 0.4℃ | 0.4℃ | 
| Resolution | 0.1℃/1℃ | 0.1℃/1℃ | 
| RTD | Range | Pt100/Pt200/Pt500/ Pt1000/Cu10/Cu50 | Pt100/Pt200/Pt500/ Pt1000/Cu10/Cu50 | 
| Accuracy | 0.2℃ | 0.2℃ | 
| Resolution | 0.1℃ | 0.1℃ | 
| Frequency | Range | 1Hz ~110KHz | 1Hz ~110KHz | 
| Accuracy | ±2words | ±2words | 
| Resolution | 0.01Hz/1Hz/0.1KHz/2KHz | 0.01Hz/1Hz/0.1KHz/2KHz | 
| Pulse | Frequency | N/A | 1Hz ~10KHz | 
| Range | 1 ~100000cyc | 
| Accuracy | ±2words | 
| Resolution | 1cyc | 
| Switch | Range | N/A | 1Hz ~110KHz | 
| Accuracy | ±2words | 
| Resolution | 0.01Hz/1Hz/0.1KHz/2KHz | 
| Pressure | Range | N/A | Depends on the pressure module | 
Accuracy=  ±(% of the set value+% of range)
 
  | Depends on the pressure module | 
| Resolution | 5 digit display | 
| Measure | DC millivolt | Range | -5 ~ 550mV | -5 ~ 550mV | 
Accuracy= ±( % of Reading+ % of Range) | 0.02%+0.01% | 0.02%+0.01% | 
| Resolution | 1uV/10uV | 1uV/10uV | 
| DC voltage | Range | -0.5 ~ 55V | -0.5 ~ 55V | 
Accuracy= ±( % of Reading+ % of Range) | 0.02%+0.01% | 0.02%+0.01% | 
| Resolution | 0.1mV/1mV | 0.1mV/1mV | 
| DC current | Range | -5 ~ 55mA | -5 ~ 55mA | 
Accuracy= ±( % of Reading+ % of Range) | 0.02%+0.01% | 0.02%+0.01% | 
| Resolution | 1uA | 1uA | 
| Resistance | Range | 0 ~5.5KΩ | 0 ~5.5KΩ | 
Accuracy= ±( % of Reading+ % of Range) | 0.05%+0.02% | 0.05%+0.02% | 
| Resolution | 0.01Ω/0.1Ω | 0.01Ω/0.1Ω | 
| Thermocouple | Range | R/S/K/E/J/T/B/N | R/S/K/E/J/T/B/N | 
| Accuracy | 0.7℃ | 0.7℃ | 
| Resolution | 0.1℃/1℃ | 0.1℃/1℃ | 
| RTD | Range | Pt100/Pt200/Pt500/ Pt1000/Cu10/Cu50 | Pt100/Pt200/Pt500/ Pt1000/Cu10/Cu50 | 
| Accuracy | 0.3℃ | 0.3℃ | 
| Resolution | 0.1℃ | 0.1℃ | 
| Frequency | Range | 3 Hz~50KHz | 3 Hz~50KHz | 
| Accuracy | ±2words | ±2words | 
| Resolution | 0.01Hz/0.1Hz/1Hz | 0.01Hz/0.1Hz/1Hz | 
| Switch | Range | N/A | CLOSE/OPEN | 
| Threshold | 200 ~300Ω | 
| Pressure | Range | N/A | Depends on the pressure module | 
Accuracy= ±( % of Reading+ % of Range) | Depends on the pressure module | 
| Resolution | 5 digit display | 
| Continuity beeper | Range | 0 ~500Ω | 0 ~500Ω | 
| Accuracy | ≤50Ωsound | ≤50Ωsound | 
| Resolution | 0.01Ω | 0.01Ω | 
Loop power supply
  | Range | 24V | 24V | 
| Accuracy | ±10% | ±10% | 
| The maximum current | 22mA | 22mA | 
Other functions
 
  | Backlight | √ | √ | 
| Auto Power-off | √ | √ | 
| Charging function | √ | √ | 
| Room temperature display | √ | √ | 
| Battery detection | √ | √ | 
| The ramp signal | √ | √ | 
| Communication function | RS232 serial communication, can realize remote control instrument by the device driver software.
  | RS232 serial communication, can realize remote control instrument by the device driver software.
  | 
| Characteristic | 
| Safety | EN61010-1:2001 | EN61010-1:2001 | 
| Withstand voltage |  The input and output AC350V/1 minutes |  The input and output AC350V/1 minutes | 
| Insulation | The input and output DC500V /50MΩ. | The input and output DC500V /50MΩ. | 
| EMC | EN61326-1:2006 | EN61326-1:2006 | 
| Authentication | CE | CE | 
| Display | 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 | 
| Size | 205 × 95 × 42 mm | 205 × 95 × 42 mm | 
| Weight | About 500g | About 500g | 
| Standard Quantity Per Carton | 10pcs | 10pcs | 
| Standard Carton Measurement | 395mm*385mm*260mm | 395mm*385mm*260mm | 
| Standard Carton Cross Weight | 12.4Kg | 12.4Kg |