Innovative equipment acc. to ASTM D1384 with solid block heating, touch-screen interface and mass-flow controllers that permit to maintain a constant air flow even in case of fluctuation of inlet air pressure: temperature and air flow are recorded and plotted on a chart on the screen. The instrument is also fitted with a water distributor and sink for condensers cooling water and a device that permits to maintain the the condensers themselves in position while removing the sample containers at the end of the test.