Which one of the following is the function of the bubble tube aligned at a 45° angle in a spirit level?

Which one of the following is the function of the bubble tube aligned at a 45° angle in a spirit level?

مندرجہ ذیل میں سے کون سا بلبلا ٹیوب کا کام روح کی سطح میں °45 زاویہ پر منسلک ہے؟
Explanation

The bubble tube set at a 45° angle is used to check inclined or sloped surfaces.

It helps ensure surfaces are accurately angled.