• DIGITAL DISPLAY: The digital display provides accurate temperature readings, making it easy to monitor and switch between cooling and heating modes. Features include temperature setting with set value and differential value control, temperature calibration, refrigerating control output delay protection, and alarm functions for temperature exceedance, temperature limits, or sensor errors. • VERSATILE USAGE: This thermometer hygrometer is suitable for household and office environments. • High-quality design with mini and lightweight construction; large and clear LCD display. • Automatically switches between cooling and heating modes to maintain ideal temperature conditions. Equipped with 2 relays. Supports Celsius temperature display. • Wide temperature measurement range: -50°C to 99°C; dual heating and cooling functionality. • Includes refrigerating control output delay protection with compressor delay protection function. • Control temperature by setting the temperature set value and differential 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 detection delay: 1 minute 5. Power supply: 110–220VAC 50/60Hz, 12VDC, 24VDC (selectable at order) 6. Power consumption: <3W 7. Sensor: NTC sensor (1 piece) 8. Relay contact capacity: 2 relays – Cooling: 10A/220VAC; Heating: 10A/220VAC 9. Ambient operating temperature: 0°C ~ 60°C 10. Storage temperature: -30°C ~ 75°C 11. Relative humidity: 20% ~ 85% RH (non-condensing) 12. Sensor cable length: 1.0m 13. Front panel size: 75 x 34.5mm; Product size: 75 x 34.5 x 85mm; Mounting cutout size: 71 x 29mm MENU INSTRUCTIONS: F1 – Temperature set value: -50.0 ~ 99.9°C (Default: 10.0°C) F2 – Differential set value: 0.3 ~ 10.0°C (Default: 0.5°C) F3 – Compressor delay time: 1 ~ 10 minutes (Default: 3 minutes) F4 – Temperature calibration value: -10.0°C ~ +10.0°C (Default: 0°C) and high-quality model: STC-1000 Functions: Switch between cooling and heating modes; control temperature via set and differential values; temperature calibration; refrigerating control output delay protection; alarm indication for over-temperature, temperature limits, or sensor faults.