... line* It is very small, convenient to carry to anywhere * The air bubble could be aggregated in 1 seconds after collision ... could be used from -20oC to 65oC* We can do the vials according to your requirements(size,color,type,precision for ... 'to3°,for glass vial could be 4", and could do the other requests also) The Delicate and cabinet plastic Mini spirit level RB-LT0006