HOKCO Weather Station - Analog - Barometer - Thermometer - Hygrometer - Aluminum Medium Electric Blue 13 in Electric Blue Anodized Aluminum Housing with 3 Analog Weather Instruments Aneroid Barometer, Analog Thermometer, Analog Hygrometer to Measure Humidity No Batteries needed Maximum altitude for barometer operation is 3,800 ft. above sea level Dimensions: 13 x 4 x 1.75 in. (33 x 10.1 x 4.4 cm)