Features: Premium Golden Mean Calipers are curved for accurate measurements. Suitable for biology, art, and math students, artists, tattoo artists, designers, bowl makers, and architects. Measures the Golden Mean, also known as the Golden Ratio (phi) 1:1.618. This caliper is commonly used for measuring eyebrow dimensions and provides precision for those in the early stages of permanent facial makeup. Widely used in microblading and other beauty applications. Made from stainless steel with a satin finish. Designed for durability and smooth operation. Includes a protective case to prevent damage. Ideal for biology and art students, makeup artists, designers, artists, dentists, and architects. The Golden Ratio Eyebrow Ruler is portable and easy to carry in a cosmetic bag or purse. Specifications: Material: Metal Size: 18 x 18 x 3 cm / 7.08 x 7.08 x 1.18 in Note: Please allow 0–1 cm error due to manual measurement. Due to differences in monitor displays, the image may not reflect the actual color of the item. Package includes: 1 Piece Golden Mean Calipers