Dimensions and tolerances

Dimensions and tolerances shall be indicated in an unambiguous manner.

NOTE 1: In the text below, ° represents the non-breaking space character.

EXAMPLE 1: 80 mm°×°25 mm°×°50 mm (not 80 × 25 × 50 mm).

EXAMPLE 2: 80 µF°±°2 µF or (80 ± 2) µF.

EXAMPLE 3: 16 kbit/s to 64 kbit/s (not 16 to 64 kbit/s).

EXAMPLE 4: 0 °C to 10 °C (not 0 to 10 °C).

EXAMPLE 4a: X = [1..8].

In order to avoid misunderstanding, tolerances on percentages shall be expressed in a mathematically correct form.

EXAMPLE 5: Write "from 63°% to 67°%" to express a range.

EXAMPLE 6: Write "(65°±°2)°%" to express a centre value with tolerance.
The form "65°±°2°%" shall not be used.

NOTE 2: For "scientific units" (e.g. "s" for second(s)), please refer to the "Use of English guide".