| Sensors | Various principle sensors can be combined in any number , up to 18 sensors; Combustible: catalytic combustion principle orinfrared principle; oxygen: electrochemical principle or zirconia principle;  toxic: electrochemical principle;  CO2: infraredprinciple;  VOC: PID photo ion principle;  CH4: catalytic combustion principle or infrared principle;  He: thermal conductivity Principle,  temperature and humidity sensors, pressure sensors (optional) (other principles of the sensor can be customized) | 
| Measure range | 0~1,10,100,1000,5000,50000,100000 PPM;0-100mg/L,200mg/L; 0-100%LEL;0-10%,20%,50%,99.999%,100%Vol(Measure range is optional and customerized)
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| Resolution | 0.001 PPM(0-1 PPM);0.01 PPM or 0.001 PPM(0~10 PPM); 0.1 PPM or 0.01 PPM(0~100 PPM);1 PPM or 0.1 PPM(0~1000 PPM);
 1 PPM(0~1000 PPM);0.01mg/L(0~200%mg/L);0.1%LEL(0-100%LEL);0.01%(0-100%VOL)
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| Display
 | Formula, gas concentration data, measurement trend curve, gas curve, battery, time, temperature, humidity, pressure (optional), pump condition, wireless status, printer status, screen shot status
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| Alarm | Buzzer, red LED and alarm status on the display, fault alarm, pump abnormal alarm, low battery alarm | 
| Data storage | Independent SD memory card, Max.32G, measurement data can be record automatically, customizable record time interval. | 
| Data transmission and download | RS232,RS485 singnal output, USB interface data transmission, with the upper computer software, can download storage, analyze and print data
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| Print function(Optional) | Optional with internal portable printer or external bluetooth printer | 
| Print content(Optional) | Text, graphics, one-dimensional code, two-dimensional code, curves, characters, etc. | 
| Charger
 | Standard Mini-USB charging port. With 13V/2A special charger (built-in printer) or 5V/2A universal charger (external printer ) | 
| Language | Chinese/English | 
| Wireless network (optional) | Bluetooth, Zigbee | 
| Network frequency | 2.4G high frequency. | 
| wireless transmission distance | Bluetooth is less than 10m, and the ZigBee outdoor single point is less than 500m. |