| Technical parameter | Parameter value |
| CO2 range | 0~5000ppm |
| CO2 accuracy | ±100ppm |
| Communication Interface | RS485 |
| Default baud rate | 9600 8 n 1 |
| Power | DC9~24V 1A |
| Display | LCD |
| Running temperature | -40~80°C |
| Working humidity | 5%RH~90%RH |
BRAND: SONBEST
TYPE: SD9770B
Email: sale@sonbest.com
WeChat: 13918126020
SKYPE: SOOBUU
Phone: +86-021-66862075
QQ1: 71182854 QQ2:613035997