The invention relates to a precision metering device for metering of a fluid, whereby these an elastic additional chamber (vk) with an inlet valve (ve) and an outlet valve (va) and a control device for actuating of the intake valve (ve) and of the exhaust valve (va) comprises. If the control device the inlet valve (ve) opens and closes the outlet valve (va), the fluid volumes in of the additional chamber (vk) on the basis of a fluid pressure provided with an upstream compressor to and expands the elastic additional chamber (vk) from. If the control device the inlet valve (ve) closes and opens the outlet valve (va) contracts the elastic additional chamber (vk) and outputs the fluid off via the opened outlet valve. The via the outlet valve (va) is discharged fluid volume on the basis of a surfaces of the form of change in the elastic additional chamber (vk) can be determined. According to the invention, the additional chamber (vk) with a capacitive extension sensor and the surfaces of the form of change is on the basis of the change in capacitance of the capacitive strain sensor can be determined.
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