The Whirling Hygrometer 116 (China), also known as a Sling Psychrometer, is a reliable and efficient instrument used to measure relative humidity and air temperature. It features two precision thermometers — one dry bulb and one wet bulb — mounted on a durable rotating frame. When spun, the difference in readings between the two thermometers allows users to determine relative humidity, dew point, and air temperature accurately.

Because of its simplicity, portability, and precision, this instrument is widely used in meteorological observations, laboratories, greenhouses, environmental testing, and HVAC inspections. Moreover, it requires no electricity or batteries, making it a dependable choice for fieldwork and educational use.

Technical Specifications:

• Model: Whirling Hygrometer 116
• Origin: China
• Measurement Range: 0°C to 50°C (approx.)
• Thermometers: Dual thermometer (wet and dry bulb)
• Material: High-strength ABS frame with protective housing
• Handle: Ergonomic, easy-grip black handle for smooth rotation
• Accuracy: ±0.5°C
• Operation: Manual — simply whirl for 30–40 seconds to obtain readings

Key Features and Benefits:

• Measures both humidity and temperature quickly and accurately
• Lightweight and portable, suitable for both lab and outdoor use
• No power source required, ensuring dependable operation anywhere
• Built from durable, weather-resistant materials for long-lasting performance
• Ideal for environmental studies, climate research, and academic training
• User-friendly design — spin, read, and calculate with ease

Applications:

The Whirling Hygrometer 116 serves multiple purposes across industries.

• In meteorology, it helps assess atmospheric humidity levels.
• In HVAC systems, it assists technicians in optimizing indoor air conditions.
• Agricultural and greenhouse professionals use it to monitor crop environments.

How It Works:

When you spin the instrument, air flows across both thermometers. The wet bulb temperature drops due to evaporation, while the dry bulb temperature remains stable. The temperature difference can then be used to find relative humidity through a psychrometric chart. Consequently, the instrument offers a quick, mechanical, and accurate way to assess air moisture content.

Care and Maintenance:

To ensure accuracy, clean the thermometers regularly and refill the wet bulb with distilled water only. Store the hygrometer in a cool, dry location away from dust or direct sunlight.

Buy a Whirling Hygrometer from Bangladesh

Buy Whirling Hygrometer 116 (China) — a reliable, portable sling psychrometer for accurate humidity and temperature measurement. Ideal for meteorological, environmental, and laboratory applications. Available at Labtex Bangladesh.