Designed to facilitate the observation of air movements in many types of flow situations, primarily in wind tunnels.  The unit is easily transported, is rapid and simple to set up and use, and produces a controllable, non hazardous smoke effect.  The smoke is produced by peristaltically pumping an innocuous, medicinal quality white oil to the tip of a probe, where a low voltage electrical coil heats it to produce a dense plume of smoke, at exactly the point where it is needed.  The probe is shaped to minimise wake generation, ensuring that the smoke can be entrained into the airstream smoothly.  A stable and clearly defined plume of smoke up to 5m in length can be generated at airspeeds up to 90m/sec (200mph).