It is suitable for the detection of heavy metals lead, cadmium, arsenic, zinc, copper and the beneficial element selenium in edible agricultural products such as grain, rice, water quality, food, aquatic products, vegetables, edible fungi. This instrument uses stripping voltammetry, with its technical advantages in trace detection, combined with screen-printed electrodes and simple sample pre-processing methods, to quickly and quantitatively analyze the heavy metal content in samples. It is suitable for use by all units and the results are accurate and stable.