The only thing you should know is the humidity gauge shows relative humidity, not the exact humidity in the tank so you do still need an exact humidity gauge if you buy this one.
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2 of 3 people found the following review helpful:
too small ...
February 12, 2013
Reviewer:
Cheryl from Vancouver, BC Canada
these are cute little gauges but they are very small ... the thermometer one does not have indication for each degree, only 70 then 80 and nothing in between when my other gauges all show 2 degree increments which i find more helpful ... it is even hard to see if they are accurate without proper increments ... i am using them but i will have to buy something better ...
Decent 
too small ...