What is the Advantages of the Tattoo Plastic Eyebrow Ruler? √ New plastic sliding vernier caliper, high durability, excellent softness can be bent. Perfect for both professional and beginners. √ Precision measuring in millimeters and inches, finely honed jaws for exacting inside, outside and depth measurements. √ Help to accurately position in eyebrow shaping and get a pair of symmetrical satisfaction brows. √ Suitable for permanent makeup tattoo eyebrow line lip and jewelers measuring and teacher teaching etc.