又大又硬又黄的免费视频,九热精品视频,保洁三级色图,欧美男女性爱视频网址,四季AV在线播放女优,福利视频免费播放无码不卡

General Description:
The C20B is a carbon dioxide designed specifically for educational applications. The C20B provides fully temperature compensated readings of Carbon Dioxide (CO2) concentrations from 0 to 65% , over the temperature range 0-40C.

The C20B has a TTL level digital output showing the instantaneous and averaged CO2 readings.