Dust sampling device

To collect a sample of dust from household or workplace for allergy testing, a filter disc 4, Fig 2, is arranged across a tube 1 which carries a sample container 62 and can be connected to a vacuum cleaner (not shown). The dust sample is deposited on the filter disc 4 and then falls by gravity into the sample container 62 which can be removed for testing of the contents. Alternatively, Fig 4, the tube 1 has a tapering flow channel 121 and a sampling element 132 which is inserted through an access aperture (141) and held in guide members 142. Air drawn in by the vacuum cleaner is accelerated in the flow channel 121 and then deflected around the sampling element 132. Dust is thus deposited by inertia on a filter fabric or medium in cavity 62.