It refers to geotextile wrapping with the weight of 300g per square meter (model) 300g / m2: It belongs to outsourcing, namely wrap something with 300g geotextile; for example: When making gravel blind ditch, the geotextile with the model of 300g/m2 should be used to individually wrap the gravel. .
The principle of geotextile wrapping on the temperature humidity sensor of standard curing room is almost the same, which is to cause the measurable properties changes by different temperatures. Such as the changes of heat expansion and cold contraction, and thermal resistance value. And then calculate the measured temperature according to their changing relationship. So, different sensors certainly have different working principle, but their basic principle of measurement is the same.
Waterproof cloth wrapping is usually adopted on high humidity occasions.
