Description
The Whirling Sling Psychrometer is a portable, mechanical instrument used to measure relative humidity based on the principle of evaporative cooling. Featuring two high-precision spirit thermometers—wet bulb and dry bulb—mounted on a rotating frame, this tool is ideal for use in fieldwork, laboratories, HVAC, agriculture, and meteorological studies.
By spinning the psychrometer, airflow causes the wet bulb to cool through evaporation. The temperature difference between the wet and dry thermometers is then used—via a psychrometric chart—to calculate relative humidity with excellent accuracy.
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Key Features
Manual Operation, No Batteries Needed
Perfect for remote locations—fully mechanical design requires no power.
Dual Thermometers
Includes one wet bulb and one dry bulb thermometer for accurate humidity measurement.
Durable Rotating Frame
Ergonomically designed handle allows smooth spinning for consistent airflow.
Precision Measurement
Spirit-filled thermometers with clear, easy-to-read scales for accurate readings.
Compact & Portable
Lightweight and easy to carry—ideal for outdoor use, HVAC techs, and educators.
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Technical Specifications
Temperature Range: Typically -10°C to +50°C (14°F to 122°F)
Accuracy: ±1°C (thermometer dependent)
Humidity Range: Calculated from psychrometric tables
Material: Plastic or aluminum frame with glass thermometers
Operation: Manual whirling via handle
Includes: Water reservoir or wick for wet bulb setup
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Applications
Meteorology & Environmental Science
Field analysis of humidity and temperature in weather observation and climate research.
HVAC & Building Inspection
Used to verify environmental conditions and validate digital sensors.
Agriculture & Greenhouses
Tracks air moisture to help regulate growing conditions and prevent crop stress.
Educational Demonstrations
Excellent hands-on learning tool in physics, geography, and environmental science.
Industrial Field Testing
Quick humidity assessments for storage, transport, or material handling operations.
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Why Choose This Whirling Psychrometer?
Reliable & Independent
Functions without electronics—great for backup or low-resource environments.
Accurate Humidity Measurement
Proven psychrometric method delivers dependable results.
Field-Ready Design
Built for mobility and durability—ideal for outdoor or industrial applications.
Affordable & Reusable
Long-lasting tool with minimal upkeep, suitable for frequent use in any setting.
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