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The level holds a tube of oil with 2 marks set 5millemetres apart at its centre. a bubble of air will travel along the tube in the opposite direction to the angle the level is held at. When the bubble sits between the 2 lines it indicated that level is either horizontal or if the tube is set so it can indicate a vertical then it shows that the level is vertical . Used by builders in the main it helps them ensure that items are true vertical ( a wall for instance) or true horizontal (a kitchen work top for instance)

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11y ago
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Q: What is the purpose of using spirit level?
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