The Aquacounter HG-400 Mercury Analyzer provides greater accuracy and sensitivity through an improved optical flow path optimization and is perfect for trace levels of mercury detection. The small body of the HG-400 is equipped with a large 7.5 inch color touch screen for ease-of-use, comes with a built in printer, and an enormous expandability to communicate with a flexible sample changer. Four different sizes of sample solutions; 5, 20, 100, and 250mL can be accommodated by adding a few optional components to the instrument. Lower detection limit 0.5 ppt (sample vol 5 mL); 5ppt (sample vols 20, 100, 250 mL).