Wall Hygrometer Premium -20 I 120 F / -30 I 50 C Description: Mini-two-in-one thermometer hygrometer: Indoor outdoor thermometer can be used indoors, such as wall, table, refrigerator, door, freezer, incubator, greenhouse, breeding booth, car, children's room, etc, or as a measuring tool to carry outdoors and use outdoors The hygrometer is suitable for almost any measuring scene Small in size: the thermometer is only 2 inches in diameter and weighs only a quarter of an ounce The thermometer is the size of a pocket watch, so you can easily take the hygrometer anywhere Measuring range: This hygrometer/thermometer accurately measures temperature and humidity simultaneously from -20 to 120 F / -30 and 50 C to suit all climates, both Celsius and Fahrenheit are available; humidity range from 10 to 100% RH Automatic calibration in 60 minutes: this weather thermometer with precision-machined thermometer coil provides accurate readings This hygrometer uses a built-in automatic induction unit that enables real-time sensing, so it does not need to be calibrated and does not require batteries Unique dial design: The thermometer adopted the original needle and dial design This thermometer is different from the digital thermometer and makes you and others different Specification: Diameter: 2 inches Thickness: 0.5 inch Weight: 10g / 0.35oz Materials: aluminum alloy outer ring, glass mirror, aluminum dial and pointer The package includes: 1 Piece Mini-Two in One Hygrometer Thermometer