A spirit level or bubble level is an instrument designed to indicate whether a surface is level or plumb.

Spirit level

Specs:

Spirit level
Size	Carton size	Qty/ctn	G.W./N.W.
60CM	61*29.5*21.5cm	30pcs	18/17kg
80CM	81*29.5*21.5cm	30pcs	22/21 kg
100CM	101*29.5*21.5cm	30pcs	28/27 kg
120CM	121*29.5*15cm	20pcs	23/22kg
150CM	151*15*15cm	10pcs	15/14kg
180CM	181*15*15cm	10pcs	18/17kg
200CM	201*15*15cm	10pcs	19/18kg