Indicators with pointers (types (a) and (c)) must rotate in a clockwise direction. The value in cubic metres for each scale division must be expressed as 10n where n is a positive or negative whole number or zero, thereby establishing a system of consecutive decades. Data such as the following must be shown near each part of the scale : × 1 000 - × 100 - × 10 - × 1 - × 0 71 - × 0 701 - × 0 7001. ... In both cases (dial and digital indicators):
- the unit symbol m3 must be shown either on the dial or in the immediate vicinity of the digital indication,
- the fastest-moving and visually readable graduated element - "the control element" - must move continuously ; its scale interval is known as the verification scale interval. This control element may be permanent or may be fitted temporarily by adding detachable parts. These parts must not have any significant influence on the metrological properties of the meter.
