The present invention concerns an apparatus for registering weight and/or water content of fit and sick individuals, where the apparatus includes a weighing cell including at least two electric conducting plates on which is applied a voltage from a power supply, and that the at least two electric conducting plates are disposed with mutually opposite faces and with adjustable spacing, so that an individual or a well-defined part of the individual may be placed between the at least two electric conducting plates. and a measuring unit including means for registering the change in capacity between the at least two electric conducting plates and means for converting the capacity change into a numerical number which is correlated with the weight and/or the water content of the individual.