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That is the specifications within which its actual size is: which means plus or minus 0.1 centimeter. Often, many things are affected by temperature and vary by size somewhat, unless given dimensions at a certain temperature. Often this is called a nominal size, as regardless of what it actually is, it is within the size sought.

11 years ago. Rating: 2
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This term means that a measurement may be inaccurate by a margin of more than 0.1cm or less than 0.1cm. This is a common allowance when measuring metals as they may expand or shrink depending on external heat or weather conditions and hence measurements are quoted to allow for this.

11 years ago. Rating: 2
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