Truly Kryptic - Online puzzle game (50 levels)

[Zawadx]

Level 39 seems impossible. The clues don't match up, and nothing makes sense.

[hb2007]

Zawadx, do you know what the device in the pic is called?

[Fippe94]

I can find a few different words for it, but none of them seems to make anything any clearer, or give any hint to how the second hint is supposed to be interpreted.

[Fippe94]

Ok, got it. dammit

[worldwideweb3]

Ok, got it. dammit

Credits: www3/jijo

[dragonsdemesne]

I'll have to start working on this again.  I got up to level 22: Isn't this odd?  but I didn't give it a try yet.

[Zawadx]

Zawadx, do you know what the device in the pic is called?

I got it with this hint. Considering this is only part of the level, maybe remove the red herrings from the image? The molarities and the ideal gas equation all just confuse you into thinking of something else, especially if you're studying science right now.

[hb2007]

Thanks for the suggestion, I have updated level 39's image.

[Chapuz]

Noob question. Any hints for level 4? I tried converting the letters to numbers like the ones that appear in my phone and reached nothing 

[hb2007]

Chapuz, it's not a noob question. You probably just have never heard of the cryptographic technique which is associated with Caesar. Just look it up

[Fippe94]

Stuck at 48. I simply have no idea what I am supposed to do. Tried a few things, but nothing makes sense to me.

[Chapuz]

Chapuz, it's not a noob question. You probably just have never heard of the cryptographic technique which is associated with Caesar. Just look it up

That was useful, thanks! I had no idea indeed, I tried everything I KNEW.
Now I'm stuck at 5, I feel so stupid. I am zooming out and still see nothing!