Humidity help

[CoolioTiffany]

Hey guy's need a little help with keeping my humidity at a steady 50-55%.

I have a 3ft beech vivarium by vivexotic which has 4 small rectangle vents, and lately im having to spray more than twice a day! It seems to be dropping fast, and always drops to 40% never any lower.

My gauge used to measure is Exo Terra Analogue Hygrometer?

Whats the best method i can use which keeps it at that level????

Auto misters??

What are you using as a heat source?

Analogue hygrometers are no good, a lot of the time not accurate at all. Try looking into purchasing an Accurite if possible. Definitely an awesome tool, it measures the warm side and cool side temp along with the humidity (it is digital). They are around $12-$15 that I have seen. You can find them at Home Depot and most likely any home improvement store. Get the one with the probe though, I've noticed there are some without the probe.