Reading a ruler, or reading plans, can be your nightmare. I was taught in mechanical drawing to do all measurements with the same notations for the same drawing. For example, if you are using inches, use it for all dimensions. If you use feet and inches, remember the notation. Reading architectural plans can create a confusion if you read a feet/inch measurement as inches.
If your measurement is 18" (eighteen inches), that could also be one foot-six inches (1'-6"). Now, a quick look at 1'-6" could look like sixteen inches (16").
As for reading a tape measure, if you get in the habit of "cutting the one" (using the 1 as the start marker instead of the end clip) you have to remember that the actual dimension is 1" less. I've goofed that up more than once.
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If your measurement is 18" (eighteen inches), that could also be one foot-six inches (1'-6"). Now, a quick look at 1'-6" could look like sixteen inches (16").
As for reading a tape measure, if you get in the habit of "cutting the one" (using the 1 as the start marker instead of the end clip) you have to remember that the actual dimension is 1" less. I've goofed that up more than once.
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