can it measure the head

Yes it can measure the human head. The outer measurement range is approximately 1" (2.5 cm) minimum to 12" (30.5 cm) maximum. Many customers use it for head related measurements including drawings, pottery, sculptures, wood working, etc. Great question. Samantha Smith Jelda

What about receiving my e=book that came with the purchase?

Hi, The e-book is automatically sent to your Amazon registered email address. You may not have received it if you have turned off email notifications from Amazon in your settings. I can send it directly to you if you go to your order and contact seller. Hope this is helpful and thank you for your business. I appreciate it! Regards, Samantha Jelda

what is the smallest measurement that these calipers can measure? Thanks!

The smallest overall measurement between the two outside points is 1.125".

how thick is the metal the tool lis made from?

The metal thickness is 1 mm which has been optimized based on significant customer feedback and many trials. If material is thicker then it becomes too bulky, more difficult to use and heavy. If the material is thinner, then it is more susceptible to bending and inaccuracy. Hope this is helpful and thanks for the question. Samantha Smith Jelda

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Golden Mean Calipers with Case - Medium 6.5in (16.5 cm) | Higher Quality Curved 3 Prong Design | Great for Tattoos, Art Work & Design | Fibonacci Gauge | Golden Ratio Calipers | Gift Item

Product ID: 52497339

Details

Brand
JELDA
Manufacturer
JELDA
Material
Stainless
Measurement accuracy
±0.02 mm
Range
1 inches

📏±0.02 mm precision

🔄Reusable & sterilizable

🪵Protective wooden case

Description

📐 Unlock the secret code of beauty with every measure!

PRECISION CURVED DESIGN - Engineered for flawless Golden Ratio measurements with ±0.02 mm accuracy
VERSATILE MEASUREMENT RANGE - From 1" to 12" (2.5 cm to 30.5 cm) to fit all your creative and technical needs
MULTI DISCIPLINARY ESSENTIAL - Perfect for artists, tattooists, architects, and designers chasing the perfect proportion
COMPLETE WITH PROTECTIVE CASE - Keeps your calipers pristine and travel-ready in a stylish wooden box
DURABLE STAINLESS STEEL BUILD - Premium material ensures longevity and professional-grade reliability

The Golden Mean Calipers are precision-engineered stainless steel tools designed to measure the Golden Ratio (1:1.618) with ±0.02 mm accuracy. Featuring a curved 3-prong design and a measurement range from 1" to 12", they come housed in a protective wooden case. Ideal for professionals and creatives in art, design, tattooing, and architecture, these reusable calipers are a must-have for anyone seeking perfect proportions and timeless aesthetics.

Specifications

ASIN	B075HKQG2V
Batteries Required?	No
Batteries included?	No
Date First Available	9 Sept. 2017
Item Package Quantity	1
Item Weight	74 g
Manufacturer	JELDA International
Manufacturer reference	JGMC-1670
Material	Stainless Steel
Measurement Accuracy	±0.02 mm
Package Dimensions	18.3 x 6.4 x 0.9 cm; 74 g
Part number	JGMC-1670
Pattern	Curved
Size	11 Inches & Above
Special Features	Golden Ratio Calipers

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