ThermoPro TP65 Digital Wireless Hygrometer Indoor Outdoor Thermometer This ThermoPro TP65 Digital Wireless Hygrometer Indoor Outdoor Thermometer (£21) can monitor the temperatures of up to three remote locations at once. Image Source: amazon.co.uk ThermoPro TP65 Digital Wireless Hygrometer Indoor Outdoor Thermometer £21 from amazon.co.uk Buy Now