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Ships within 48 hours · Estimated delivery Jul 7 - Jul 12
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Description
Stereo Butterfly TestThe Stereo Butterfly tests and evaluates random dot stereo depth perception for both gross stereopsis (2500 to 1200 seconds of arc) and fine depth perception. The figures present on the test cannot be identified without viewing glasses. Graded circle test (800 to 40 seconds of arc) Animal test for children (400 to 100 seconds of arc) 1 pair of Standard 3 D Viewers Answer key on back cover
The Stereo Butterfly tests and evaluates random dot stereo depth perception for both gross stereopsis (2500 to 1200 seconds of arc) and fine depth perception. The figures present on the test cannot be identified without viewing glasses.
Graded circle test (800 to 40 seconds of arc)
Animal test for children (400 to 100 seconds of arc)
1 pair of Standard 3-D Viewers / Answer key on back cover
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
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- We offer a 30-day return/exchange service after receiving.
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4.0 ★★★★★
Based on 237 reviews
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Product Reviews
★★★★★ 4
Very Effective, but Not the Instructions
Size: 150Pk - 8" x 1/2", Style: Cord Wrap Cable Ties, Color: Black and Gray
These work very well, but when you remove them from the box, you see two donuts, one grey, one black, of 75 tightly wrapped cable ties each. So far, so good.
First deficiency: The "how to use" pictures---three of them---are tiny light line drawings in 7/16" x 7/16" boxes. If you don't have a 400-power microscope, maybe a magnifying glass will do. Maybe Velcro---a "name" brand that should know better---thinks that the use of these devices is obvious. Well, "obvious" is obvious only when it's obvious, and that can vary from person to person. They should assume nothing.
Second deficiency: Before trying (and, one hopes, succeeding) at using these ties, one must determine exactly now to remove the first tie from the outside of either donut. Obvious? No, not really, because, as it turned out, it requires some effort to remove the first one---the placement and circumstances of which do not at all (not on my set of these, anyway) suggest in any concrete way which one should be taken first. No one wants to tear up a couple of ties just to figure out how not to tear up ties by removing them incorrectly or out of order.
The punishment here is four stars that could have been five.
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Reviewed in the United States on May 13, 2026
★★★★★ 5
Must Have for Cable Management.
Size: 100Pk - 6” x ½”, Style: Cord Wrap Cable Ties, Color: Black
Best Velcro out the. Great for cable management. Super easy to use. Cannot be beat for the price. Incredibly useful.
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Reviewed in the United States on April 29, 2026
★★★★★ 5
Great product
Size: 150Pk - 8" x 1/2", Style: Cord Wrap Cable Ties, Color: Black and Gray
Very good size and holds a lot. Good color and number of ties. Works well to reduce clutter
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Reviewed in the United States on May 19, 2026
★★★★★ 5
Wonderful cable management
Size: 100Pk - 6” x ½”, Style: Cord Wrap Cable Ties, Color: Black
Love this Velcro product and use them in lots of applications. They really are helpful for wire bundle management.
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Reviewed in the United States on May 26, 2026
★★★★★ 5
Organize must have
Size: 100Pk - 6” x ½”, Style: Cord Wrap Cable Ties, Color: Black
The price, quantity and quality is perfect! I went from a tangled mess to organized so quickly with these easy Velcro strips. Highly recommended for organizing cords, shortening cords for clean look.
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Reviewed in the United States on March 12, 2026
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