This is a combination of thermometer and hygrometer for indoor and outdoor use. A practical and useful device for home and office, aquarium and fish tank use. You will easily know the indoor and outdoor temperature and humidity of this device. It also can be used as a gift to your friends, they will like it. Features - Color: White. - Material: Plastic. - Size: About 10.00X9.20X2.00cm/3.93X3.62X0.79inch. -Note: The color of the key font is . - Temperature measurement range: -50 degree centigrade~70 degree centigrade - Humidity measurement range: 10% ~90%RH - Temperature resolution: +0.1C (0.1°F) - Humidity resolution: 1%RH - Temperature measurement accuracy: +1C (1.8"F) - Humidity measurement accuracy: +5% (30%-70%) - Battery: battery (Not included) - Storage conditions: -20~60 degree centigrade/20-80%RH - Made of plastic material, strong and durable for a time. - Help to provide a healthy and comfortable water environment for all kinds of fish. - Large LCD screen for easy and clear reading, easy to use. - Not only monitor real time temperature and humidity, it also displays the exact time, it also have clock function. - Suitable for office, bedroom, greenhouse, living room and more. Package list: 1 x thermometer