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Frey Scientific Sling Psychrometer, Pack of 15

Item #: 1440860
$114.69 $86.02
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Frey Scientific Sling Psychrometer is an economical but effective device using the difference in the readings of a wet-bulb and a dry-bulb thermometer to find out the relative humidity. The wet-bulb thermometer is cooled by the evaporation of the water when whirled and shows a lower reading than the dry-bulb thermometer. Comes with a chart for getting relative humidity. Pack of 15.
  • Substantial set is perfect for your classroom
  • A fun, hands-on activity that will keep your students engaged
  • An excellent supplement to your meteorology unit
  • A great way to get your kids outside
  • Chart