L3200 series biological microscopes are equipped with excellent infinity plan achromaticobjectives and wide field eyepieces. The ideal ergonomic design is adopted,such as low-lying focusing knobs, backward nosepiece and integrated handle, so that operate the instruments easier and have wider space, especially moving the instruments is better safety. They can be used for biology, medicine agriculture and industry area widely. They are the ideal instrument in medical treatment, teaching demonstration and scientific research.