Achieve professional-level accuracy in pupillary distance measurements with this 9-piece PD ruler kit, designed to simplify the process of measuring eye distances for glasses fitting and vision correction. Whether you're measuring for single PD (one eye) or dual PD (both eyes), this ruler provides clear markings and ergonomic features that make it easy to use at home or in an optician setting. Each ruler is crafted from high-transparency PVC material that is flexible, durable, and easy to read. The transparent design ensures precise alignment with your pupils while reducing visual distortion. The surface is smooth and comfortable on the skin, making it ideal for repeated use or multiple measurements across different individuals. A curved nose bridge section is integrated into the straight-edge layout to help center the ruler properly over the face. This feature keeps the ruler stable and reduces errors during measurement. Whether you are measuring your PD for new prescription lenses, replacement frames, or customizing sunglasses, this ruler helps ensure a more accurate fit. The ruler supports a wide measurement range, typically from 25mm to 40mm per eye, making it suitable for most users. Dual-sided scale printing lets you use the ruler with either hand, while its compact size fits easily in a drawer, bag, or optical kit. Included in the package are 9 PD rulers. Ideal for optical professionals, DIY glasses shoppers, or anyone needing reliable and consistent pupil distance readings. This PD measurement tool for eyes is also useful for measuring lens widths and eyeglass frame sizing, making it a versatile and essential addition to any eyeglass repair or fitting toolkit.