Epson TM-U300C Operator's Manual page 39

10. Environmental Conditions
Temperature:
Operating:
Storage:
Humidity:
Operating:
Storage:
5° to 40°C (41° to 104°F)
For the TM-U300C/U300PC, when the temperature
is 30°C (86°F) or more, the operating humidity is
limited.
-10° to 50°C (14 to 122°F) (excluding paper and ribbon)
TM-U300C/U300PC: 20% to 80% (non-condensing)
TM-U300D/U300PD: 30% to 85% (non-condensing)
TM-U300C/U300PC: 20% to 90%
(non-condensing, excluding paper and ribbon)
TM-U300D/U300PD: 30% to 90%
(non-condensing, excluding paper and ribbon)
33