• DIGITAL DISPLAY :The digital display provides accurate temperature readings, making it easy to monitor and Switch the modes between cool and heat;Control temperature setting the temperature setting value and the difference value; Temperature calibration; Refrigerating control output delay protection; Alarm when temperature exceeds, temperature limit or when sensor error. VERSATILE USAGE :This thermometer hygrometer is perfect for household use, making it ideal for use in your home or office. Features: • High quality ;Mini and light weight design; large and clear LCD display. • Auto converts cooling and heating modes to keep your equipment in an ideal temperature range. .Have 2 relays .Switch between cooling and heating modes. Support celsius display. • Wide temperature range (-50-99 °C); dual heating and cooling function. • Refrigerating control output delay protection; With compressor delay protection function for refrigerating control. • Control temperature by setting the temperature set value and the different value. Technical Parameters: 1.Temperature measuring range: -50 ° C ~ 99 ° C 2.Resolution: 0.1 ° C; 3.Accuracy:+- 1° C (-50 ° C ~ 70 ° C); 4.Sensor error delay: 1 minute 5.Power supply: 110-220VAC 50/60Hz, 12Vdc , 24Vdc ( Choose power supply when you place order ) ; 6.Power consumption: <3W; 7.Sensor: NTC sensor (1PC); 8.Relay contact capacity: Two Relay Cool 10A/220VAC; Heat 10A/220VAC; 9.Ambient temperature: 0 ° C ~ 60 ° C; 10.Storage temperature: -30 ° C ~ 75 ° C; 11.Relative humidity: 20% ~ 85% (No condensate) 12.Sensor length: 1.0m 13. Front Panel Size: 75x34.5mm ; Product Size: 75x34.5x85 mm ; Mounting Size: 71x29mm Menu Instruction: Code Function Set Range Default F1 Temperature set value -50.0~99.9°C 10.0°C F2 Difference set value 0.3~10.0°C 0.5°C F3 Compressor delay time 1~10 minutes 3 minutes F4 Temperature calibration value -10.0°C~10.0°C 0°C brand new and high quality modle: STC-1000 Switch the modes between cool and heat; Control temperature by setting the temperature setting value and the difference value; Temperature calibration; Refrigerating control output delay protection; Alarm when temperature exceeds temperature limit or when sensor error.