Seiko TM-U590/U590P - Manual (Page 48)

4-10 Reference Information
Environmental Conditions
Notes:
When the temperature is 34°C, the humidity must be 90% or less.
When the temperature is 40°C, the humidity must be 65% or less.
When the temperture is 45°C, the humidity must be 50% or less.
Temperature: Operating: 5° to 45°C (41° to 113°F)
Storage: -10° to 50°C (14° to 122°F)
(except for paper)
Humidity: Operating: 10 to 90% RH
Storage: 10 to 90% RH (except for
paper)