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National 446TBL-20 1x/3x Stereo Microscope(National 446tbl 20 1x 3x Stereo Microscope)

Original price was: $355.00.Current price is: $97.99.

SKU: DGFUB 8907224976 Categories: Microscopes, Optics, Optics & Surveillance Tags: Microscopes, National 446TBL-20, Optics & Outdoors

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Description
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10W Top/Bottom Tungsten Lighting
45ï¿½ Inclined Viewing Head
20x Stereo Eyepiece
1x/3x Objectives, 20x/60x Magnification
Parfocalled/Parcentered Paired Objective
80mm Frosted Glass Stage
Rack and Pinion Focusing

The 446TBL-20 1x/3x Stereo Microscope from National Optical is aï¿½dual magnification stereoscopic microscope fit for laboratories, high school and university students. The stereo (two) eyepiece configuration is preferred by most researchers and students because of the superior depth of field and comfort compared to monocular microscopes. This model of the 446 stereo microscope has a paired 20x eyepiece delivering 20x and 60x magnification. Two achromatic paired objectives are parcentered and parfocalled to keep the specimen centered and focused when switching between the two magnification settings. The stageï¿½can beï¿½illuminated from aboveï¿½and/or below using 10Wï¿½tungstenï¿½lightsï¿½activated by separate base-mounted On/Off switches.ï¿½The top (incidental) light source has an adjustable beam to help optimize the brightness and contrast of the specimen.

A user-friendly designï¿½complements theï¿½range of features that make the 446 stereo microscope a welcome addition to labs as well as classrooms.ï¿½The heavy-duty post-mounted adjustable viewing head permits use of specimen heightsï¿½up to 35mm / 1.4″, andï¿½is also capable ofï¿½360ï¿½ï¿½rotation to help share the eyepiece among colleagues and studentsï¿½without moving the microscope. The rack and pinion system has a single focus dialï¿½andï¿½includes a slip clutchï¿½mechanismï¿½toï¿½prevent mishandling. An adjustable interpupillary distance, left-side diopter correction, and reticle holder/retainer provide the 446 series with the flexibility needed to create a customized viewing experience.

Optical System

Paired 20xï¿½inclined eyepiece
1x and 3x achromatic objectives
20xï¿½and 60x magnification
Parfocalled, parcentered,ï¿½paired objectives
75mm / 3″ working distance, 35mm / 1.4″ maximum specimen height
Eyepiece withï¿½diopter adjustment and reticle holder/retainer
55-75mm / 2.2-3″ interpupillary distance

Focusing

Rack and pinionï¿½focus system
Slip clutch prevents over-turning
Tension adjustment prevents focus drift

Lighting

Incidental (top)ï¿½10 wattï¿½tungsten illumination with adjustable beam
Transmittedï¿½(bottom)ï¿½10 wattï¿½tungsten illumination
Dual base-mounted On/Off switches

Construction Details

80mm frosted glassï¿½and 80mmï¿½reversible black and white stageï¿½plates
Locked on metal stage clips
360ï¿½ rotating viewing head
Cast metal frame
Grey enamel finish
14.6″ (37 cm) maximum height
5.5ï¿½lb (2.5 kg) weight

In the Box

National 446TBL-20 1x/3x Stereo Microscope

Eyeshields
Dustcover
Lifetime Limited Warranty (Excluding Bulb)

Microscope Type	Stereo
Eyepiece	20.0x
Objective(s)	1.0x / 3.0x
Head	Inclined
Light Source	12 V, 10 W tungsten (incidental/transmitted)
Light Control	4-position On/Off
Stage	80 mm frosted glass and reversible black/white contrast plate
Interpupillary Adjustment	2.2 – 3″ (55 – 75 mm)
Maximum Specimen Height	1.4″ (35 mm)
Maximum Height	14.6″ (37 cm)
Weight	5.5 lb (2.5 kg)

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