... institutes for metallurgaphy technic inspection and failure analysis Large Stage Measuring MicroscopeObjective: 4X,10X,PL20X,PL40X;Eyepiece: 10X,12.5X; ... 500X;Sliding trinocular head(binocular head), interpupillary distance: 55-74mm, 30°inclinded, 360°rotatable;Stage: 400X300mm, moving range X-Y: 254X254mm ... 12V/50W halogen lamp;Function: bright field, polarizing, photograph,etc. measuring microscope