bids are invited for stereo zoom dissecting microscope with photo micrographic attachment - modular/diascopic stereo type body with galilean or better corrected optical system type, head should be 30°, & 360° rotatable with iris diaphragm head: eyepiece should have wf10x field of view 23mm high-point, interpupillary distance 51-75 mm; dioptric adjustment: in both eyepiece ±5mm, parafocal plan 1x & 2x; magnification 0.65x....5.5x or more, and can increase up to 320x magnification with additional accessories; zoom ratio should be 9:1 or more; working distance should be 110 mm.advance stand: illumination: white led incident and transmitted illumination system, with independent intensity controls using knobs at both sides of the base. led power should be 3w, colour temperature not less than 6300k. life time warranty on led. focusing: by means of a rack and pinion controlled by a pair of knobs placed on both sides of the head holder. coaxial coarse and fine focus (graduated 0.002 mm). the tension of focusing can be adjusted. the head holder can slide along the fixed arm.optical cold light generatorlight source should be high power 7.2w led light source life time65000 hours chromaticity coordinates (x,y) 0.320, 0.320 (pure white, 6300k) optical power (with double-arm): illuminance should be at 170000 lux 10 cm distance power supply brightness control potentiometer. external power supply provided. detailed specifiaction of the item are relected in the pdf document attached with the tender notice , trinocular stereo zoom microscope with automontage facility or edf technology - head :should have trinocular head with 100/0 - 0/100 (on right tube) optical system should be infinity corrected galilean typehead should be 20° inclined,eyepiece should have wf10x field of view 23mm high-point;interpupillary distance 52-112 mm;dioptric adjustment: both eyepiece;objective:plan apochromatic 1x, n.a. 0.15;0.75x....13.5x or more zoom objective;zoom ratio should be 18:1 or more;working di