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Constantly supplies fresh, humid air to your terrarium.Eliminates hand spraying--except when needed for dew licking animals.Helps maintain a healthy humidity level.For use with up to a gallon tank.Many of the exotic reptiles and amphibians kept in home terrariums have come from tropical and subtropical regions of the world and should be maintained under conditions similar to those of their native environment. To keep these animals successfully, considerations must also be given to size of cage, type of substrate to use, opportunities for climbing and hiding, types of food and its availability, types of light, as well as preferred temperature and humidity. Of these, humidity is probably the least well understood and the most difficult to achieve.Some facts about relative humidity.Relative humidity is a term that describes the percentage of water vapor present in air of a certain temperature. Warm air can hold much more vapor than colder air. This means that the relative humidity of air increases as the temperature drops, and decreases as the temperature rises, even though the actual amount of water vapor in the air stays the same. As an example, outside air temperatures in much of the United States usually drop to degrees F and below during late fall, winter, and early spring, and average relative humidity levels are often measured to be around If in our homes and centrally heated apartments the air temperature is then raised to a comfort level of to degrees F, the relative humidity of that air automatically drops to about 15%. This is extremely dry air which is unsuitable for almost all amphibians except those who spend their entire lives in water. Even reptiles could suffer from dehydration, unless they happen to come from extremely arid regions.Obviously, venting a rainforest or woodland terrarium to such dry ambient air could be detrimental to the inhabitants, animals as well as living plants. It is, of course, common practice to regularly mist the terrarium, both to maintain humidity and to provide water for animals that do not drink from a bowl. This does help to keep a reasonable level of humidity, but does not refresh the air. Similarly, maintaining a large reservoir of water in the terrarium and relying on the rate of evaporation for keeping air moisture in the terrarium can not prevent stale and unhealthy air. A terrarium simply should be properly ventilated. The TropicAire Humidifier and Air Exchanger was developed to help overcome these problems. Especially during the cooler months of the year, when the air in heated homes and apartments is the most dry, the TropicAire will provide a steady flow of fresh, humidified air to help maintain a comfortable environment for all moisture-loving reptiles and amphibians.To check for relative humidity in the terrarium.Since the level of relative humidity depends on air temperature, both humidity and temperature should be measured in the terrarium. Good quality d