The negative pressure gauge indicates that the value needs to be observed whether it is within the predetermined range, and if it is not within the range, the negative pressure should be adjusted.
The negative pressure meter indicates that the value needs to be observed to be in a predetermined range, if not within the range to be adjusted for negative pressure.
The indication value of the negative pressure meter should be observed whether it is in the predetermined range. If not, the negative pressure should be adjusted.<br>