A device for testing a specimen comprising a liquid input means (20) having a receiving inlet (22) and a discharge aperture (24), filter means positioned below the input means (20) having at least one reaction zone (32) for receiving liquid (60) from the input means (20) and at least one peripheral zone (34) associated with the at least one reaction zone (32), absorbent means (40) associated with only the peripheral zone (34) of the filter means (30), and retainer means (50) for holding the filter means (30) in position below the liquid input means (20) such that the at least one reaction zone (32) receives liquid (60) therefrom.
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