Description : Mini Two - in - one Thermometer Hygrometer : Indoor outdoor thermometer can be used indoors , such as wall , table , refrigerator , door , freezer , incubator , greenhouse , breeding box , car , baby room etc . or as a measuring tool to carry outside and use outdoors . Hygrometer is suitable for almost any measuring scene Mini size : The thermometer is only 2 inches in diameter and weighs only a quarter of an ounce . The thermometer is the same size as the pocket watch , so you can easily take the hygrometer anywher Measuring Range : This hygrometer / thermometer accurately measures temperature and humidity simultaneously ranges between - 20 and 120 F /- 30 and 50 C to accommodate all climates , both Celsius and Fahrenheit are available ; humidity range from 10 to RH Automatic Calibration within : This weather thermometer with a precision - made thermometer coil ensures accurate readings . This hygrometer uses a built - in automatic induction unit that enables real - time sensing , so you don &# 39 ; t need to calibrate it and does not require a battery Unique Dial Design : The thermometer took the original needle and dial design . This thermometer stands apart from a digital thermometer and sets you and others apart Specification : Diameter : 2 inches Thickness : 0 . 5 inch Weight : 10g / 0 . 35oz Materials : aluminum alloy outer , glass mirror , aluminum dial and pointer Package Includes :(2 Pack) 1 Piece Mini Two - in - one Thermometer Hygrometer