Eyebrow calipers are some of the industry's most known and used tools when assistance is necessary to obtain the perfect symmetry. These calipers are extremely accurate, sturdy and precise. They will not hesiate for you to locate the golden ratio. Unsure about how to use these? Please watch this video on our yourtube first: Brow Mapping Caliper assistant in symmetrical eyebrow measurement: https://www.youtube.com/watch?v=hH-4uQNjW3g