GSC International PSYCHRKT Sling Psychrometer Kit. Pack of 10 Psychrometers. The Sling Psychrometer is a practical hands-on tool for understanding atmospheric humidity and temperature. Measure Humidity with Ease: Our Sling Psychrometer Kit is a straightforward tool used to measure the moisture content in the air. By comparing temperatures from two thermometers students can accurately determine relative humidity and dew point. Wet and Dry Bulb Thermometers: The kit includes both a wet bulb and a dry bulb thermometer which give different temperature readings when spun. This temperature difference is then used to calculate humidity levels providing a hands-on learning experience. Durable Design and Temperature Range: Each thermometer is made with a metal backing and measures a broad temperature range from -20 to 110 making it suitable for diverse weather conditions and laboratory experiments. Complete with Wooden Handle and Instructions: The psychrometer is equipped with a sturdy wooden handle for easy spinning. Instructions are included helping students understand the step-by-step process of using the psychrometer and interpreting the results. Includes instructions PRODUCT WARNINGS WARNING: This product can expose you to chemicals including nickel and lead which are known to the State of California to cause cancer birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov. This product contains latex which can cause allergic reactions in some people. If symptoms of an allergic reaction occur stop use immediately and consult a physician. This product contains small parts making it a choking hazard. Only use with adult supervision. Our products are not toys. Use in a laboratory or educational setting only. Not for children 13 and under.