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Sure thing. They're not air tight, there are several openings with 'socks' on the inside and outside that cinch closed. They're very light tight however. The only place where you'll see light is through the zipper...but only when the lights are on inside, off outside, and you're at the right...

I think they're great. Much easier than converting a closet or making a separate room. Just remember to keep in mind that ventilation is a must.

Yes, there are different meters. No, you cannot use the soil PH meter for testing water.