National Model 420-430PHF-10 Stereoscopic Microscope. It is considered new, it was only used for demonstrations. It is in the original packing box and unused dustcover. It still has that new look and feel.
Rack and pinion focusing with large dual focusing knobs with slip clutch (That prevents damaging mechanism) Tension adjustment eliminates focus'drift'. 10x eyepieces are 45° inclined, dual diopter adjustments, interpupillary adjustment from 55mm to 75mm. Zoom Range 10x thru 40x Magnification. Top light -- 12v -15-watt halogen,, rheostat control to dim the top light. Bottom light --- 110v- 5-watt fluorescent for cool operation, greater light efficiency.
Two 80mm stage plates (frosted glass and reversible black/white plastic contrast plates). There is a tiny chip on the very edge of the glass plate insert.
Blue filter for transmitted light. The convenience and versatility of viewing a large image at 10x magnification, then zooming continuously all the way to close details at 40x magnification or any point in between.
Upright, un-reversed 3-dimensional image remains in focus throughout the zoom range. Features top light for incident illumination and a bottom light for transmitted illumination. Paired widefield eyepieces 10x / FN20 are 45° inclined with dual diopter adjustments.
Interpupillary adjustment from 55 to 75mm. Eyepiece tube diameter is 30mm. Eyepieces accept reticle with 23mm O.Viewing head rotates 360°, available as binocular or trinocular viewing head. Zoom ratio: 4:1 (10x to 40x with standard supplied lenses). Achromatic color corrected parfocalled optical system provides sharp focused 3-D image throughout the zoom range.
79mm working distance with standard lenses. Total magnification range with optional lenses 2.5x-120x. Top light is 12V/15W halogen, with blue filter, for incident illumination with adjustable beam and rheostat control. Bottom light is 110V/5W fluorescent light which provides bright light for transmitted illumination. 4-position light control: top only/bottom only, top&bottom on/off.Large dual focusing knobs, heavy-duty rack & pinion with slip-clutch and tension adjustment. Tension adjustment eliminates focus drift. Focusing block fits 25mm diameter post.
Working distance range with optional lenses 34-137mm. Standard post stand with built-in transformer for extra stability and space saving. Stage surface 165x220mm deep (6.5x8.75). Includes two 80mm frosted glass and black/white contrast plates. Stand length: 237mm (9.25"), stand width 170mm (6.63"), overall height 330mm (13).
Net weight 4.9 kg. The item "National Stereo Zoom, 420-430PHF-10,10X-40X, 10X Eyepieces, Top & Bottom Light" is in sale since Monday, September 14, 2020. This item is in the category "Business & Industrial\Healthcare, Lab & Dental\Medical & Lab Equipment, Devices\Microscopes". The seller is "mikroscopes" and is located in Marietta, Georgia.
This item can be shipped worldwide.