ThermoPro TP65 Digital Wireless Hygrometer Indoor Outdoor Thermometer For Winter, this ThermoPro TP65 Digital Wireless Hygrometer Indoor Outdoor Thermometer ($24) is going to be such a lifesaver. It can monitor the temperatures of up to three remote locations at once. Image Source: amazon.com ThermoPro TP65 Digital Wireless Hygrometer Indoor Outdoor Thermometer $24 from amazon.com Buy Now