 Nanoparticles are more toxic after inhalation than larger particles of the same chemical composition so it's very important to control exposure for nanoparticles. So this is a personal sampler for measuring nanoparticles in the air. The nanoparticles are sucked into this and collected on a filter and it's a small cyclone that only detects the nanoparticles not the larger particles and air is sucked into the machine by this little hand-held personal sampler. The main achievement of the NanoDevice project is to reduce the uncertainties regarding the safe use of nanomaterials and the safe handling of nanomaterials in the workplace. The potential is that the NanoDevice project has developed 17 portable and affordable hand-held devices for monitoring nanoparticle exposure in the air to provide measures for the safe handling of nanomaterials at the workplace.