Pipettor with adjustable measuring range

The utility model relates to the technical field of pipettors, in particular to a range-adjustable pipettor which comprises a shell, a distance adjusting mechanism and a drawing mechanism are mounted in the shell, and the distance adjusting mechanism comprises a sliding groove formed in the inner wall of the shell; the first sliding block is connected into the sliding groove in a sliding mode, a limiting block is fixedly connected to the first sliding block, and the limiting block is connected with the inner wall of the shell in a sliding mode; the first spring is fixedly connected to the outer wall of the top of the limiting block, one end of the first spring is fixedly connected with the inner wall of the top of the shell, the connecting rod can be squeezed to the top of the limiting hole under the counter-acting force of the first spring, and then the limiting block can be fixed; the distance adjusting mechanism is arranged, the position of the limiting block is fixed by adjusting the distance adjusting me