A device for quality assesment of an electrical impedance measurement on tissue of a subject wherein the tissue is skin, the device comprising: an impedance signal unit arranged to obtain impedance data of a tissue region of said tissue of the subject, said data comprising at least one impedance value measured in said tissue region; an evaluation unit arranged to apply an evaluation algorithm to the obtained impedance data, whereby the quality of obtained impedance data is assessed, the evaluation algorithm comprising: a pre-processing part configured to reduce spikes and/or background noise from the obtained impedance data whereby adjusted impedance data is obtained; a pre-filter configured to determine whether the adjusted impedance data is non-physiolgyigal and to reject non-physiological impedance data by comparing the adjusted impedance data with a predetermined impedance data range, wherein data being outside said range are rejected; an acral filter configured to determine whether the adjusted impedance data has been obtained from acral skin and to reject impedance data which exhibitis properties typical of acral skin; and a main classifier configured to reject or approve the adjusted impedance data based on a plurality of parameters including at least one parameter from the group consisting of variation of magnitude, variation of phase, absolute value of magnitude, absolute value of phase, skewness of magnitude, skewness of phase and variation of phase maxima position, wherein if the impedance data of a measurement is rejected by the pre-filter, the acral filter or the main classifier, the quality assessment of the measurement is that it is of poor quality and if the impedance data of a measurement is not rejected by any one of the pre-filter, the acral filter and the main classifier, the quality assessment of the measurement is that it is of good quality; and a presenting unit arranged to present the assessed quality of the impedance data such that a decision can be made on whether to use the impedance data for diagnosing a condition of said tissue of the subject. an impedance signal unit arranged to obtain impedance data of a tissue region of said tissue of the subject, said data comprising at least one impedance value measured in said tissue region; an evaluation unit arranged to apply an evaluation algorithm to the obtained impedance data, whereby the quality of obtained impedance data is assessed, the evaluation algorithm comprising: a pre-processing part configured to reduce spikes and/or background noise from the obtained impedance data whereby adjusted impedance data is obtained; a pre-filter configured to determine whether the adjusted impedance data is non-physiolgyigal and to reject non-physiological impedance data by comparing the adjusted impedance data with a predetermined impedance data range, wherein data being outside said range are rejected; an acral filter configured to determine whether the adjusted impedance data has been obtained from acral skin and to reject impedance data which exhibitis properties typical of acral skin; and a main classifier configured to reject or approve the adjusted impedance data based on a plurality of parameters including at least one parameter from the group consisting of variation of magnitude, variation of phase, absolute value of magnitude, absolute value of phase, skewness of magnitude, skewness of phase and variation of phase maxima position, wherein if the impedance data of a measurement is rejected by the pre-filter, the acral filter or the main classifier, the quality assessment of the measurement is that it is of poor quality and if the impedance data of a measurement is not rejected by any one of the pre-filter, the acral filter and the main classifier, the quality assessment of the measurement is that it is of good quality; and a pre-processing part configured to reduce spikes and/or background noise from the obtained impedance data whereby adjusted impedance data is obtained; a pre-filter configured to determine whether the adjusted impedance data is non-physiolgyigal and to reject non-physiological impedance data by comparing the adjusted impedance data with a predetermined impedance data range, wherein data being outside said range are rejected; an acral filter configured to determine whether the adjusted impedance data has been obtained from acral skin and to reject impedance data which exhibitis properties typical of acral skin; and a main classifier configured to reject or approve the adjusted impedance data based on a plurality of parameters including at least one parameter from the group consisting of variation of magnitude, variation of phase, absolute value of magnitude, absolute value of phase, skewness of magnitude, skewness of phase and variation of phase maxima position, wherein if the impedance data of a measurement is rejected by the pre-filter, the acral filter or the main classifier, the quality assessment of the measurement is that it is of poor quality and if the impedance data of a measurement is not rejected by any one of the pre-filter, the acral filter and the main classifier, the quality assessment of the measurement is that it is of good quality; and a presenting unit arranged to present the assessed quality of the impedance data such that a decision can be made on whether to use the impedance data for diagnosing a condition of said tissue of the subject.