The difference between the actual and measured value.

Example: When your instrument measures in "1"s, then any value between 6½ and 7½ is measured as "7", so the error is plus or minus ½.

Which we write as

Example: When your instrument measures in "1"s, then any value between 6½ and 7½ is measured as "7", so the error is plus or minus ½.

Which we write as

**7 ±0.5**
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