Unique, compact Sling Psychrometer determines percent relative humidity (RH). No need for complicated tables. Slide rule calculator correlates wet and dry bulb thermometer indications for direct reading of relative humidity. When not in use, the thermometer slides into the handle for protection.

Perfect, low cost measurement of comfort conditions in air conditioned environments, storage areas, hospital operating rooms. Use for tests in industrial atmospheres when high or low humidity and static electricity can be crucial in manufacturing processes. Great tool to determine safe conditions for sports practice.

• Slide rule construction quickly converts temperature to relative humidity
• Built-in water reservoir holds sufficient water for hours of testing
• Accuracy ±5% RH