3. Recording function: Record indoor and outdoor temperature, maximum/minimum humidity. 1. Display: Three channels and indoor temperature and humidity can be displayed at the same time, and level III indoor environment comfort can be displayed. 2. Detection range: Indoor temperature, test range 0 ℃ - 50 ℃, outdoor temperature, test range - 50 ℃ - 70 ℃; Indoor and outdoor humidity, detection range: 20% - 99%. Indication of indoor and outdoor temperature and humidity change trend. 4. Functions: Alarm function for exceeding the upper and lower limits of indoor temperature and humidity, temperature and humidity calibration function, time and date display. 5. Easy to use: It can be hung and stood, accurate and reliable., Weight: 0.86421206704 pounds, Manufacturer: Aisuoka