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.
30cm	33*26*36cm	60pcs	17/16 kg
40cm	43*26*36cm	60pcs	22/21 kg
50cm	48*26*36cm	60pcs	24/23 kg
60cm	63*26*36cm	60pcs	30/29 kg
80cm	83*26*19cm	30pcs	20/19 kg
100cm	103*26*19cm	30pcs	25/24 kg