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Understanding Humidity in the Crabitat

September 25, 2012 in Caresheets

Originally written by Vanessa Pike-Russell-Updated by Stacy Griffith

What is Humidity?

Humidity is a measure of the amount of water vapor in the air. It can be expressed in several ways.

“Specific humidity” is the mass of water vapor per unit mass of combined dry air and water vapor, generally expressed in grams per kilogram. The specific humidity of an air parcel does not change with temperature.

“Absolute humidity” is the density of water vapor, expressed as grams per cubic meter of air.

“Relative humidity” is discussed below. Related terms are “saturation,” which describes the condition where water vapor is at a maximum concentration for the air temperature (warm air can hold more moisture than cold);

“dew point temperature” the temperature at which saturation occurs if air is cooled at constant pressure without addition or removal of water vapor; and

“vapor pressure,” which in meteorology is that part of the total atmospheric pressure due to water vapor content.

Reference: Arctic Climatography and Meteorology

What is the Ideal Humidity Range?

Humidity should be between 50-60% for Actual and around 70-80% relative humidity.

How can I measure humidity within my Crabitat?

You will need to buy a humidity gauge, also known as a hygrometer.
There are many kinds, some of the more popular are shown below.








ESU Gauge HUMIDITY & TEMPERATURE GAUGE (BI-METALLIC COILS)

The ESU Reptile Humidity & Temperature Gauge allows you to accurately monitor humidity levels from 0-100% and temperature levels from 60o to 120oF (15o to 48oC) in your reptile’s habitat.

Flukers combo gauges HUMIDITY & TEMPERATURE GAUGE (BI-METALLIC COILS)

Fluker s round thermometer is calibrated to enable you to effectively monitor an Environmental Temperature Range (ETR) within your pet s enclosure to promote good health and longevity

Fluker s relative humidity hygrometer allows to establish and maintain a consistent level of humidity within your pet s enclosure, creating a safe and comfortable environment.

Fluker's digital humidity gauge HUMIDITY & TEMPERATURE GAUGE (DIGITAL)

The digital thermometer/hygrometer comes equipped with a “min/max” button that displays the minimum and maximum levels your enclosure has experienced. This is important for measuring severe, sometimes fatal fluctuations in the temperature and humidity level. The product also has a (C) Centigrade and (F) Fahrenheit temperature display choice, depending on the owner’s preference.

Hermies and Herps Digital Combo HUMIDITY & TEMPERATURE GAUGE (DIGITAL)

The digital thermometer/hygrometer comes equipped with a “min/max” button that displays the minimum and maximum levels your enclosure has experienced. This is important for measuring severe, sometimes fatal fluctuations in the temperature and humidity level. The product also has a (C) Centigrade and (F) Fahrenheit temperature display choice, depending on the owner’s preference. Comes with a probe to test at substrate level, or for hot spots. Made in Asia.

TRex combo pack gauges HUMIDITY & TEMPERATURE GAUGE (BI-METALLIC COILS)

The T-Rex Habitat Thermometer is compact and mounts naturally at any desired location inside the habitat, giving accurate readings in a wide range from 60 F to 120 F. For best results, use two: one in the hottest area of the enclosure, the “baking zone” and one in the coolest corner.

Zoo Med Combo Pack HUMIDITY & TEMPERATURE GAUGE (BI-METALLIC COILS)

Allows for precise monitoring of both the temperature and humidity of your terrarium from one unit!
Thermometer scale: 20 to 140 F (-6 to 60 C).
Humidity scale: 0 to 100%.

Digital Gauge with Alert Accurate Measurement of Water Temperature with Low/High Temperature Alert Preprogrammed for Tropical Fish & Clock for your convenience.

  • Digital Thermometer with probe
  • 3ft (with all plastic probe & suction cup cord) allows for accurate measurement of water temperature
  • Low/High temperature alert plus on/off button
  • Fahrenheit Display (75-82 degree F)
  • Dimension (L x H): 2-2/3″ x 1-2/3″

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