tender for supply and installation of three (03) magnus ch20i microscopes and one (01) stereo zoom microscope (instavision insta sze) in the c us of the vidyasagar university , supply of instruments , magnus ch20i microscopes: magnus ch20i microscopes; optical system: achromat optics with uniformly centered, interchangeable &parfocal components, with tropicalized anti-fungal treatment that ensures image excellence for long periods in conditions favoring fungal growth. objectives: ineaachromat 4x, 10x, 40x, 100x eyepieces: icwhk 10x (fn 18 mm) paired eyepiece. the unique optical design provides relief from eye fatigue and renders wide-field images of utmost clarity. compatible with optionally available eyepiece micrometer diopter correction: dioptric adjustment available on the left eyepiece tube observation head: binocular head (45 degree inclined), 360 degrees rotatable, with diopter adjustment on the left. interpupillary distance 53 -75mm trinocular head (45 degree inclined), 360 degrees rotatable, with diopter adjustment on the left. interpupillary distance 53 -75mm. power supply: built-in illumination base with pre-centered 6v 20w halogen light source coupled with an efficient collector lens system. universal power supply 100v-240v ac 50/60hz single phase. nose piece: quadruple revolving outward nosepiece based on precision ball-bearing mechanism with positive click stop. body: aluminum die- cast body with all critical movements based on ball bearing and wire guides, thereby ensuring smooth and precise manipulation. mechanical stage: co-axial low drive mechanical stage 120 mm x 132 mm with traverse area of 76 mm x 30 mm with single slide holder. focusing system: co-axial coarse and fine controls with a focus adjustment and fine adjustment knobs. coarse focus range 20mm. fine focus rotation 0.25mm. condenser holder: rack and pinion mounted condenser holder condenser: pre-centered abbe condenser with aperture iris diaphragm (n.a. 1.25) focusable with rack & pinion and a continuously variable iris diaphragm with a removable blue filter for daylight observation; magnification range: 40x ~ 1000x for observation; led life: 30,000 hrs , stereo zoom microscope (instavision sze) model: instavision sze specifications: optical system: greenough zoom ratio: 1:6.4 magnification range: 0.7x to 45x continuous working distance: 110 mm eyepiece: 10x paired with 20 mm field of view illumination: led. 3.3watts. incident & transmitted with light intensity control. led life: 25000 hrs