SKU: 51852836247

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

$33858.00 $37620.00
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Description

National 446TBL-20 1x/3x Stereo Microscope10W Top Bottom Tungsten Lighting 45 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 adual magnification stereoscopic microscope fit for laboratories, high school and university students. The stereo (two) eyepiece configuration is preferred by most researchers and

  • 10W Top/Bottom Tungsten Lighting
  • 45� 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 a�dual 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 stage�can be�illuminated from above�and/or below using 10W�tungsten�lights�activated by separate base-mounted On/Off switches.�The top (incidental) light source has an adjustable beam to help optimize the brightness and contrast of the specimen.

A user-friendly design�complements the�range of features that make the 446 stereo microscope a welcome addition to labs as well as classrooms.�The heavy-duty post-mounted adjustable viewing head permits use of specimen heights�up to 35mm / 1.4", and�is also capable of�360��rotation to help share the eyepiece among colleagues and students�without moving the microscope. The rack and pinion system has a single focus dial�and�includes a slip clutch�mechanism�to�prevent 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 20x�inclined eyepiece
  • 1x and 3x achromatic objectives
  • 20x�and 60x magnification
  • Parfocalled, parcentered,�paired objectives
  • 75mm / 3" working distance, 35mm / 1.4" maximum specimen height
  • Eyepiece with�diopter adjustment and reticle holder/retainer
  • 55-75mm / 2.2-3" interpupillary distance
Focusing
  • Rack and pinion�focus system
  • Slip clutch prevents over-turning
  • Tension adjustment prevents focus drift
Lighting
  • Incidental (top)�10 watt�tungsten illumination with adjustable beam
  • Transmitted�(bottom)�10 watt�tungsten illumination
  • Dual base-mounted On/Off switches
Construction Details
  • 80mm frosted glass�and 80mm�reversible black and white stage�plates
  • Locked on metal stage clips
  • 360� rotating viewing head
  • Cast metal frame
  • Grey enamel finish
  • 14.6" (37 cm) maximum height
  • 5.5�lb (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)
All product and company names are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
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Exchange/Return Notes
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  • Final sale items are not eligible for returns or exchanges.
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SKU: 51852836247

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4.4 ★★★★★
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Product Reviews
C
Verified Purchase
C Harper
Charlottesville, US
★★★★★ 5
Super durable!
Color: 2PK Green Leaping Phrog
Yellow lab approved bc they are fun to chew. Mom approved because they last forever!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 7, 2026
A
Verified Purchase
Arele
Whiting, US
★★★★★ 5
Great toy for two big German Shepherds
Color: Brown
We only buy Tuffy dog toys now because we have one German Shepherd, and we often watch our daughter's GSD too, and the two dogs tear anything else apart in minutes. Tuffy toys are BY FAR superior to any other dog toy we have tried. That being said, some Tuffy toys seem to last longer than others with the two dogs, and this one has been pretty good! We've had it for a few weeks now, and it's just now starting to show some white (stuffing) where their teeth have pierced the top of the toy. That's pretty good, considering they play tug of war with it and can tear into toys pretty hard. If it were just our one dog, I think it would last a lot longer because it's the tug of war between the two of them that does them in faster. Even so, when they do manage to tear the fabric in vulnerable places, I just pull the stuffing out from that area, and they continue to play with it, sometimes for months! This one is better than some other Tuffy toys too because it has lots of areas where there is already more fabric and reinforced seams than stuffing, like all the legs on the side, the tail, and even the pincers. So far, they haven't been able to tear into those at all. Just a bit on the top of the head, and so far, no stuffing coming out yet. This one is a big win for us! When they finally do do it in, I will turn around and buy another Scorch the Scorpion right away!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 5, 2014
D
Verified Purchase
Deholle
Draper, US
★★★★★ 4
Tuffy Desert Phrog vs Lola
Color: Green Leaping Phrog, Color: Green Leaping Phrog
Just a little background about my dog. Lola is a 5 year old corgi-terrier mix with jaws of steal. Lesser stuffed toys have met death in under 5 minutes. Tennis balls last less than a day. Rope toys that do not have frayed ends might possibly last a week (frayed ends never stand a chance). The only toys that she has not managed to destroy are her Kong, a Kong bone, and a racquet ball. I figured I would document the life span of Phrog (Tuffy Scale: 9) before making my final judgement on it’s durability. Day 1 - Phrog Arrives! Lola was very excited about the arrival of Phrog and immediately went into destruction mode. Phrog did sustain a little damage before we were able to bribe her to drop Phrog and get her understand that he was more fun to play fetch with than to mutilate. The white you see in the picture is not stuffing, but the second layer of defense for the toy. The fact that my living room is not full of stuffing and I didn’t have to pry a squeaker out of my dog’s mouth, I’d say Phrog wins the Day 1 challenge. Day 9 - Phrog has sustained a little more damage, but not anything life threatening. His side wound is a little bit larger and one of his eyes is half ripped off. For safety reasons, I am going to finish removing the damaged eye and some loose thread from various places. Other than that, Phrog is still holding up and holds top toy spot. I have also found him very useful for dealing with anxiety; the squeaker can often distract her from her stressors and Phrog takes the abuse of her frustrations. Day 16 - Phrog is starting to show signs of mortal wounds. Lola has made it through the thicker layer around his arm and I can see the stuffing. It is only a matter of time before gets all the way through. Day 60 - Phrog still lives!!! I have done some surgery on Phrog to reinforce the fabric around his arms, but Franken-Phrog is still the favorite of all of the toys. She will even get brave enough to rescue Phrog from the evil vacuum when he is kidnapped and tortured. I am thinking about purchasing Phrog II for the inevitable day when Phrog goes off to the pet toyland in the sky, but for now, there is only one Phrog for Lola.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 6, 2018
M
Verified Purchase
michael parsley
Lexington, US
★★★★★ 5
Super tough
Color: Red Warthog
My dogs love these toys!!!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 10, 2026
A
Verified Purchase
Amazon Customer
Charlottesville, US
★★★★★ 5
Long lasting play toy!
Color: Multicolor
Tuffy toys in general are great and they are a pretty good deal on Amazon. They are not indestructible, and if your dogs use them as chew toys they will eventually break through. My dogs have had this Armadillo since Christmas (and they do chew on it some) and the only thing missing is an ear. They like to play tug-of-war with it a lot. This is a bigger toy, but even my forty pound dog plays with it. I would not recommend this toy for dogs smaller than Border Collie size. You can make these Tuffy toys last longer if you don't allow your dogs to chew them--when your dogs starts chewing on non-chew toys trade them for a chew toy and when you catch your dog chewing on a chew-approved toy reward them for chewing. Eventually your dog will catch on and realize that if they want to chew there are certain toys that are allowed for that. In addition to being a great play toy this is a pretty cute toy too!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 30, 2015

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