Storage temperature: -65 to 160°F (-54 to 71°C) Ambient temperature limits: -58 to 160°F (-50 to 71°C) models 36-39, 520-525, 701-705: 0 to 160°F(-17 to 71°C) set point typically shifts less than 1% of range for a 50°F (28°C) ambient temperature change less than 2% for types E121& E122 Set point repeatability Temperature models: ±1% of adjustable range