L3001 Series EPI-fluorescence microscope are equipped excellent UIS optical system and adopted modularization function design idea, can obtain excellent optical quality and operation performance. They are equipped with no magnification spherochromatic aberration infinity plan achromatic fluorescent objectives and wide field eyepieces, have clear and high contrast picture in wide view field. The main body design meets with the ergonomics needs, such as low-lying focusing knobs, backward nosepiece, so that feel comfortable and relaxed in process of operation. They can be used as transmitted light micorscope. They are widly applied in the biological pharmacy, medicine checking and measure, disease prevent and etc.