Description: 【Measuring Head】: The Ophthalmic Lens Clock is made of a special material with high smoothness to prevent scratching the lens and avoid wear and tear due to improper use. 【Shockproof Design】: The Curve Optician Lens is designed to avoid falls and vibrations, ensuring accurate measurements every time. 【Durable Stainless Steel Shell】: Crafted with a stainless steel shell, this tool is not easily damaged, promising long durability. 【Accurate Lens Measurement】: By placing the measuring head vertically on the mirror surface, it provides precise data for lens measurement. 【Precise Scale and Pointer】: The Curvature Measure Gauge features an accurate scale and anti shaking pointer that are clearly visible for easy reading. It's suitable for measuring lens curvatures of 1.53/1.599/1.61/1.67 values. Size Chart: 5.6cm/2.20inch Package Includes: 1 Optometry Tool Note: Please allow slightly errors due to manual measurement and different monitors.