The Water Bath Sample Concentrator is used for the concentration or preparation of samples in large quantities (such as drug screening, hormone analysis, liquid phase, and sample preparation in mass spectrometry analysis). It combines a precision water bath with nitrogen injection needles to concentrate samples. By blowing nitrogen into the surface of the heated sample, the solvent in the sample is quickly evaporated and separated to achieve an oxygen-free concentration of the sample. Features • Independent adjustable needle valve to control the gas flow at each sample location • Compatible with test tubes (dia. 10 – 29mm), conical flasks, centrifuge tubes, sample capacity of 1-50ml • Circular turntable structure, 360° rotation for conventional sample support into and out of the water bath. Easy to operate • 12 positions, with each sample position numbered, spring tube clamp fixed position • LED real-time displays temperature and time • All use of stainless steel. All components are anti-corrosion and resistant to organic solvents • For concentrated toxic solvents, the entire system can be placed in a fume hood • Built-in level sensor, anti-dry protection • Suitable for a variety of test tubes with the gas needle aimed at the center of the test tube