spirit level
INSTRUMENT WITH A SEALED TUBE OF LIQUID, DESIGNED TO INDICATE WHETHER A SURFACE IS HORIZONTAL (LEVEL) OR VERTICAL (PLUMB)
Waterlevel; Spirit-level; Bubble level; Torpedo level; Tube level; Level (tool); Spirit Level; Carpenter's level
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ميزان التسوية ، الشاقول الافقى ، ميزان البنائين