Reddit mentions of Exo Terra Exo Terra Analog Hygrometer

From my reading, it looks like any analog dial style reptile or cigar humidor hygrometer should work a treat. I ordered one from amazon but still waiting for it to show up.
Exo Terra Hygrometer https://www.amazon.com/dp/B00026053Y/ref=cm_sw_r_cp_api_2M-KBbTK1JW4P

I looked up the humidity % for West Lafayette. You do indeed live in a pretty humid area - ranging from 71-88% in the next two days. By contrast, Vancouver (where in my experience slugs cannot survive indoors - including a basement apartments), the humidity is currently at 62-82%.

You can buy a cheap hygrometer for $5-10 in the reptile section of any pet store (example here or more fancy one). I use both of these types to monitor humidity levels in my slug terrariums. I would like to see you buy one of those and then post back what the readings are in your room.

In my tanks I like to see my humidity level in the 85-95% range, that's where I'm going to see the highest activity level from my slugs. Around the 80% level their activity level will be reduced. Around 60-70% you start to see defensive hibernation and clumping of slugs to preserve body moisture. Below 50% is not conducive to slug life. That should be your goal for your room. You can get there by running a dehumidifier, air conditioner, maybe just opening your windows and getting more circulation (alternatively, if it's more humid outside than in your bedroom, try keeping the windows always closed).

Slugs are nocturnal, so yeah, past midnight is when you're going to see them. They're not wandering around outside during the day, they're sleeping. If there's no food in your room, they might just be coming in because other slugs have been coming in. Slugs excrete pheromones in their slime trails, communicating sexual readiness ... other slugs wishing to reproduce will follow a potential mate's slime trail for quite some time. In other words, your bedroom might be some kind of destination spot for slug orgies. They also have memories which, according to studies last at least 4 months or longer, so even if your bedroom doesn't have food, if it used to have food four months ago by the previous tenant, that might be worth a trip to an adventurous slug. Then once the slug with the memory goes in, other slugs may follow the trail hoping to find food, romance or both.

I'm also curious about what the slug population is like outside your place, in the grass and any gardens outside. Take a flashlight (your phone flashlight is fine) at around 11pm, the day after it's rained if possible, and just shine a light along the grass and any vegetation. I bet there's loads of slugs out there.

you could put a glass full of water in there to try to help.

If you think its that bad, go down to the pet store and pick up a hydrometer, for reptile cages. It should only be a few bucks. It won't be 100% accurate, but should give you a good idea of where you are at.

http://www.amazon.com/Exo-Terra-PT2466-Hygrometer/dp/B00026053Y/ref=zg_bs_3048857011_3

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