Model: ETC-974 Temperature measure range: NTC probe:-50-110°C(-58-230°F); PTC probe:-55-140°C(-67-284°F) Display resolution: 1°C/0.1°C(with the swithch mode between integer and decimal) Accuracy: NTC:±0.5°C(-30°C-50°C);other±1°C. PTC:±1°C(-30°C-50°C); other±2°C Probe type: NTC(-50°C-120°C); PTC(-50°C-150°C) Power supply:230VAC±10% ;50/60Hz Rated current of the relays(refrigeration ,defrost and fan):8A/220VAC Use temperature:-5°C-55°C Relative humidity:10%-90%RH (not condensing) Storage temperature:-30°C-85°C Input: NTC sensor Sensor lenth:2M(include the probe) Theory: Temperature Controller Display Type: DIGITAL Usage: Household Power Type: Charger Style: Standing and Wall Hanging Display Size: 1.9 Inches & Under color:Black Material:plastic size:77 x 34.5 x 58mm Package Contents: 3 x ETC-974 Digital Temperature Controller