Cool Eyebrow makeup Tool - The golden ratio ruler microblading calipers use to measure, locate and shape equal eyebrows on both sides of the face. Quickly and easily draw a beautiful eyebrow shape and improve the efficiency of eyebrow drawing. It is used to fix the eyebrow measurement and reduce the embarrassment of eyebrow asymmetry. PRECISION DESIGN TOOL - This golden mean caliper has an exact scale (PHI (1: 1.618) - golden proportion) that is considered aesthetically beautiful and frequently appears in nature and in the human body, particularly in the human face such as the size and position of the eyebrows. It is easy to use, and it is available for novice thrushes, personal daily use, and tattoo embroiderers' fixed eyebrows.