Low pressure fronts, fog, rain...eliminate your need for the weather channel with your very own weather station! It includes a barometer for measuring air pressure and predicting incoming weather, a hygrometer for measuring moisture and a thermometer (Celsius and Fahrenheit) for keeping track of highs, lows, and averages. Instruments come calibrated, but include instructions to confirm their accuracy and how to calibrate them again if need be. Gauges are approximately 2.75' in diameter; kit includes instruction manual. Recommended for ages 5 & up.