29 A register and all ancillary equipment shall remain within the applicable limits of error when tested under the following conditions:
(a) an ambient temperature in the range of -30°C to +40°C, except that a register and all ancillary equipment that are designed for use in a temperature-controlled environment shall be tested over the range of ambient temperatures that is specified by the manufacturer and marked on the name-plate of the register; and
23 A non-resettable register that operates from the main power supply and that is exposed to ambient temperatures within the operating range of the register shall, in the event of a power outage, continue to function for a period of at least
[...]
