The present invention relates to an arrangement (1) for detection of a first resonance frequency (F1), related to a mass (1b′) loaded carrier means (1b), and to compare said first resonance frequency (F1) with a second, as a reference used, resonance frequency (F2), related to said carrier means (1b), by using frequency comparing and/or calculating means (3, 4) to evaluate, by a noted frequency shift (F2-F1), a mass weight (1b′). An array of individual carrier means (1a, 1b . . . 1n) are arranged adjacent to each other, that one or more of said carrier means are allotted different second resonance frequencies, that received resonance frequencies (F1) from said loaded carrier means are received and/or evaluated simultaneously, or at least essentially simultaneously, in a signal receiving and/or processing unit (3) and that said first resonance frequencies (F1) are compared and/or calculated within said calculating means (3, 4) with corresponding resonance frequencies (F2) stored in said unit (3, 4) in a memory (4b) thereof.