this is how to check that your spirit level is accurate
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Step 1: Step 1
hammer two nails into a piece of timber that is longer than your level
Step 2: Step 2
place the spirit level ontop of the nails
Step 3: Step 3
hammer either nail intill the spirit level is level
Step 4: Step 4
turn the spirit level 180 degrees so that the opposite end of the spirit level is on each nail
Step 5: Step 5
check for level
Step 6: Step 6
if your spirit level is accurate, the reading should be the same