It happens that the result provided by the device seems abnormally low, close to 0, 05 g/L CO2 while wine clearly contains a higher amount of dissolved CO2. The filter or the needles are maybe stopped up or wet. In this case, remove the needle from the headspace, change the filter and measure again. If the problem persists, change the needle also. If the problem persists, perform the device calibration. Incas of persistent problem, please contact our commercial service.