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Create a weather station right in your classroom with these durable meteorological instruments. Students can measure and record barometric pressure relative humidity and air temperature on a daily or hourly basis and record the trends averages and highs and lows. The sturdy carrying case holds a barometer hygrometer and Celsius and Fahrenheit thermometer as well as three stands for use of the instruments individually. The included Activity Guide explains in detail how to use each instrument. Each instrument measures approximately 3 across.