Techne Sample Concentrator Needles, SS, 127 mm; 100/Pk, Quickly concentrate multiple samples in a block at onceVariable needle position suits various Dri-Block insertsNeedles, block, and block heater sold separately, Concentrator blows an inert gas over the surface of your samples via stainless steel needles (not included). Blown gas in combination with the heat from the heater produce ideal conditions for fast efficient evaporation. Insert needles into a silicone membrane in any configuration. Fully adjustable gas reservoir provides accurate height control. Maximum vertical traveling distance is 32 cm. Maximum gas usage is 15 L/min.