Description:Product Name:Tube BrushSpecifications:Small Medium Medium LargeThe test tube brush is mainly used to clean the test tube in the chemical laboratory.Its handle is made of metal such as iron, with a tough cylindrical brush at the top and some protruding bristles at the top.Instructions:Wet the tube to be cleaned or fill in one-half of the volume of distilled water, then extend the tube into the inside of the tube, so that the top bristles fit snugly against the bottom of the tube, then twitch the tube handle up After the cleaning is completed, the test tube brush is taken out. If the distilled water inside the test tube is neither aggregated into water droplets nor flowed down, it is Cleaned up. Then pour the test tube on the test tube rack.The package includes:10* test tube brush