The golden ratio ruler calipers use to measure, locate and shape equal eyebrows on both sides of the face. In eyebrow measurement, eyebrow positioning and eyebrow designs. Golden ratio calipers eyebrow ruler has an exact scale (PHI (1: 1.618) - Divine Proportion) that is considered aesthetically beautiful and frequently appears in nature and in the human body, particularly in the human face (Example: The size and position of the eyebrows). Precision design tool can do great things to enhance your creative talents and incorporate the beauty of nature into your creative endeavors easy to carry and convenient to use.Adopting high quality non-toxic material. High quality stainless steel. Ideal for Permanent Makeup Artist and Beginner, Makeup Artists, Artists and Architects.Our golden ratio ruler calipers eyebrow calipersgives more precision to those who are in the initial stages of permanent face makeup,who can use the Perfect Makeup tools at home or on a trip,anytime and anywhere