XSP-12, 15 biological microscope is designed to observe the biological specimen and experiment in the agricultural scientific research units and secondary schools.Magnification: There are six kinds of magnifications for XSP-12 from 50X to 500X There are six kinds of magnifications for XSP-15 from 50X to 640X XSp-13A, 16A biological microscope is designed for the routine examination in medical and hygienic establishments, laboratory, research institutes and colleges. It can be used for the research, clinical experiments and education demonstration in biology, bacteriology.Magnification: There are nine kinds of magnifications for XSP-13A from 50X to 1250X There are nine kinds of magnifications for XSP-16A from 50X to 1600XItem Specification XSP-12 XSP-15 XSP-13A XSP-16A Objective 10X-0.25 - - - - (35mm) 40X-0.65 - - - - 100X-1.25 - - 5X - - - - Eyepiece 10X - - - - (Huygens) 12.5X - - 16X - - Plane Stage W-Clips - - W-M-Stage - - Abbe NA1.2 Condenser - - Diaphragm Disc - - Iris - - Blue & Frosted Filters - - Plan-concave Mirror - - - - Packing Each Set is Packed in a Wooden Case with Handle, Lock and Key. Four Wooden Cases are Packed in a Outer Carton (57-47-44cm-32Kgs)