Although the popular hard plastic water bottles are strong, heat-resistant, cold-resistant and odor-free, they have potential safety hazards and should be avoided. Because the chemical material widely used in the production of hard plastic water bottles is polycarbonate, an important substance in this material is bisphenol a (abbreviated as BPa). Although BPa brings convenience to humans, some experts in the United States and Canada also point out that it can cause damage to the body's immune system. Some environmental organizations in the United States and Canada encourage people not to use plastic water bottles containing BPa. For your own health, giving up a hard plastic water bottle and switching to a glass or steel water bottle is a healthy way to drink. SC61 High End Stereo Microscope Sc61 High End Stereo Microscope ,Stereo Light Microscope,Stereo Binocular Microscope,Dissecting Microscopes Ningbo Beilun Kalinu Optoelectronic Technology Co.,Ltd , https://www.nbyxmicroscope.com