Answer:
What can go through glass without breaking it?
What can be measured but not seen?
We are all around, yet to us you are half blind. Sunlight makes us invisible, and difficult to find
Break it and it is better, immediately set and harder to break again.
My first is high, My second damp, My whole a tie, A writer's cramp
Be sure to shout for its answers are weak, but there is no language it cannot speak.