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

3Bubble Spirit Level

Specs:

Size	Carton size	Qty/ctn	G.W./N.W.
30cm	32*31*28.5cm	60pcs	13/12 kg
40cm	42*31*28.5cm	60pcs	17/16 kg
50cm	52*31*28.5cm	60pcs	21/20 kg
60cm	62*31*28.5cm	60pcs	25/24 kg
80cm	82*31*28.5cm	30pcs	15/14 kg
100cm	102*31*28.5cm	30pcs	17/16 kg