How thick (height) is this ruler? Is the measurement shown a height of 0.01 inch correct?

I'm not sure I understand your question and presume that you mean that if it were laid on a flat surface and I looked at it while it was there, would it be 0.01 inch above the surface. I honestly don't know. However I will say that it's a good weight which leads to it's durability. It's versatile and comfortable in the hand. As with almost all Amazon products, you are given a reasonable amount of time to return it. However, as stated, this is my second one since beginning to sew again during the Pandemic after a very, very long period of not having done so. I also was studying pattern drafting at the time. This was a necessary ruler and served me well in each respect. I personally cannot see a sewist, knitter or quilter without it. It's lite weight, but again, durable and the markings are clear. I wouldn't be concerned about the 0.01.

What is on the back of the ruler that makes it non slip? From the pictures, it doesn't look non slip.

It comes with a four-pack of small rubber “feet” you stick on the back of the ruler.

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Mr. Pen Quilting Ruler, 3 x 17 Inch, Acrylic, Single Piece Plastic, Ideal for Short & Long Fabrics, Suitable for Beginners & Professionals

Mr. Pen Quilting Ruler, 3 x 17 Inch, Acrylic, Single Piece Plastic, Ideal for Short & Long Fabrics, Suitable for Beginners & Professionals

Product ID: 437336470

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Details

Material
Plastic
Brand
Mr. Pen
Colour
Clear
Style
Compact
Graduation range
1/8 Inches

⚡0.003mm measurement accuracy

📏3 x 17 inch precision

🪶lightweight & durable acrylic

Description

📏 Cut with confidence, craft with style.

UNMATCHED ACCURACY - Laser-etched markings with 0.003mm precision ensure flawless measurements every time.
FOR EVERY SKILL LEVEL - Designed to empower beginners and pros alike—tailors, designers, and sewing enthusiasts included.
EFFORTLESS READABILITY - Clear, bold numbers and markers stand out on any fabric color, reducing eye strain and errors.
DURABLE YET FEATHERLIGHT - Crafted from thick, high-quality acrylic that’s built to last without weighing you down.
PRECISION MEETS PORTABILITY - Compact 3 x 17 inch size perfect for any fabric length, from quick trims to full-length cuts.

The Mr. Pen Quilting Ruler is a 3 x 17 inch acrylic measuring tool engineered for precision sewing and crafting. Featuring ultra-clear, laser-etched markings with 0.003mm accuracy, it combines durability and lightweight design for effortless handling. Ideal for both beginners and professionals, this compact ruler enhances accuracy and efficiency across all fabric projects.

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