Bottle attachment for handling liquids with a cylinder-piston arrangement for precisely taking up and dispensing partial liquid volumes, with a cylinder and a piston running in a sealed-off manner in the cylinder and having a piston rod led upwards out of the cylinder, a displacement measuring strip arranged directly on the piston rod and extending axially in the direction of movement of the piston rod, a sensor arrangement arranged fixed in place in the bottle attachment adjacent to the piston rod and having a sensor aligned with the measuring strip and separated from the measuring strip only by a narrow gap, an indicator for the amount of liquid that is respectively handled or to be handled, and an electronic evaluation circuit for evaluating output signals of the sensor and, if appropriate, for activating the indicator, wherein the electronic evaluation circuit can also be realized by the software of a microprocessor or microcomputer, characterized in that the sensor in the sensor arrangement lies in the clear profile of the piston rod and that the piston rod has a recess making it possible to have the corresponding position of the sensor and - that the measuring strip is an optical scale and the sensor arrangement is a high-resolution reflected light system, wherein, on the one hand, the measuring strip is arranged on the piston rod and, on the other hand, the sensor arrangement with the sensor is arranged such that, when the piston rod is in a desired position, a surface of the measuring strip which faces the sensor forms a plane which lies on a longitudinal mid-axis of the piston rod, or - that the measuring strip is a plastic strip mixed with magnetic powder or, preferably, a ceramic strip and the sensor arrangement is a high-resolution reflected light system, preferably a magneto resistive system, wherein the sensor detecting a magnetic field of the measuring strip lies on the longitudinal mid-axis of the piston rod, or - that the measuring strip is a capacitive displacement measuring strip and the sensor arrangement is a high-resolution capacitive measuring system, wherein, when the piston rod is in a desired position, the longitudinal mix-axis of the sensor rod lies between a surface of the measuring strip which faces the sensor and the sensor itself. - that the measuring strip is an optical scale and the sensor arrangement is a high-resolution reflected light system, wherein, on the one hand, the measuring strip is arranged on the piston rod and, on the other hand, the sensor arrangement with the sensor is arranged such that, when the piston rod is in a desired position, a surface of the measuring strip which faces the sensor forms a plane which lies on a longitudinal mid-axis of the piston rod, or - that the measuring strip is a plastic strip mixed with magnetic powder or, preferably, a ceramic strip and the sensor arrangement is a high-resolution reflected light system, preferably a magneto resistive system, wherein the sensor detecting a magnetic field of the measuring strip lies on the longitudinal mid-axis of the piston rod, or - that the measuring strip is a capacitive displacement measuring strip and the sensor arrangement is a high-resolution capacitive measuring system, wherein, when the piston rod is in a desired position, the longitudinal mix-axis of the sensor rod lies between a surface of the measuring strip which faces the sensor and the sensor itself.