Tolerance in text

["Links, Diederik" <D -dot- Links -at- hde -dot- nl>]

Hi All,


I have a few questions about measure tolerances wrote in text.

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Point 1:
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What is the best way to write a measure with tolerance - where both '+' and '-' are equal - in a text (or non-technical illustration)?

I normally write:
	"Drill a hole with a diameter of 25 +/-0.2 mm."
My colleque writes:
	"Drill a hole with a diameter of 25 ±0.2 mm."

I _obviously_ prefer the first one.
Because the '±'-sign means 'approximately' (the hole can be 24 mm or 26 mm) and not 'plus or minus' (the hole must be between 24.8 mm and 25.2 mm).


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Point 2:
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What notation is correct or more, preferrable:
A.	"Drill a hole with a diameter of 25 +/-0.2 mm."
	"Drill a hole with a diameter of 25 mm +/-0.2 mm."

B.	"Drill a hole with a diameter of 25 +0.2/0.5 mm."
	"Drill a hole with a diameter of 25 +0.2 mm/0.5 mm."



Thanks in advance for the advice.


Diederik Links
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