27. A battery-operated weighing device, when exposed to battery voltage output less than or in excess of the nominal voltage or voltage range, shall

• (a) perform within the applicable limits of error; or

• (b) blank the weight indication and prevent the transmission, printing and storage of weight results.

28. A weighing device shall perform within applicable limits of error when exposed to relative humidity of up to 85 per cent

• (a) where a temperature range is marked on the device, within that temperature range; and

• (b) where no temperature range is marked on the device, at any temperature of at least -10°C and no more than 40°C.

29. An electronic weighing device, when disturbed by interference such as the effects of electromagnetic or electrostatic fields, short time power reduction, voltage spikes, electrostatic discharges or other disturbances that may be encountered under normal conditions of use, shall

• (a) provide a weight indication or recording that does not differ from the value of the weight indication or recording that would be provided without interference by more than one verification scale interval;

• (b) blank the weight indication and prevent the transmission, printing and storage of weight results;

• (c) provide an error message and prevent the transmission, printing and storage of weight results; or

• (d) provide a weight indication that is so completely unstable that it cannot be interpreted, stored or printed as a correct measurement value.

30. A weighing device shall be of a design, composition and construction that

• (a) under normal conditions of use, enables it to measure accurately and does not facilitate the perpetration of fraud; and

• (b) provides it with a static operating mode for inspection purposes, even if the device is designed to be used in a dynamic operating mode.

31. Weighing device features that perform metrological functions shall be designed, composed and constructed so that they

• (a) ensure accurate measurement;

• (b) do not detrimentally affect the performance of the device;

• (c) do not lead to measurement errors; and

• (d) do not facilitate the perpetration of fraud.

31.1 Neither gross values nor tare values shall be entered manually in on-board weighing systems.

32. A weighing device may perform non-metrological functions provided that those functions do not alter the metrological functions of the device.