The utility model provides a convenient to use's pipette, it includes (1) is responsible for in the imbibition that has a scale, its characterized in that of is responsible for (1) scale top in the imbibition and establishes a branch pipe (3), and (1) height is responsible for in the imbibition that highly is higher than of branch pipe (3), installs check valve (4) in branch pipe (3), and check valve (4) mounted position is not less than the last mouth of pipe (2) that the imbibition was responsible for. The utility model has the advantages of convenient to use, easy operation, the cost of manufacture is low.