... range 0.5-4degree * Can bear -30to70 degree * Name, Metal circular vial* No.,RB-MP6518* Color, Yellow&Green* Size,65 ... MM* Material, Acrlic&Aluminum, it is steady and have high accuracy* Precision is45'+/-8', * Air bubble will be ... middle of vial when put the vial on the level table. * The air bubble could be aggregated in 2 ... 4", and could do the other requests also) High Quality Metal Bull Eye Vial