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.
What is the Ideal Humidity Range?
Humidity should be between 60% for Actual and around 80% relative humidity.
How can I measure humidity within my crabarium?
You will need a hygrometer or humidity gauge. I prefer digital myself but analogue work too.
How can I boost the humidity in my crabarium?
One way to increase the humidity is to introduce moss into your crabarium.
Not all types of moss are hermit crab-friendly.
Precision Analog Reptile Humidity Gauge:
Accurately reads the amount of water vapor saturation (this means humidity) in the air of your [crabarium] terrarium.
Monitoring humidity is very important for all types of [land hermit crabs] reptiles as it helps in preventing stress and dehydration, which can lead to respiratory, bacterial or fungal infections, skin shedding problems, etc