ไม้บรรทัดวัดระยะทาง PD & PH ออปติคอล แบบปรับได้ สําหรับนักเรียน

Summary: In the process of optometry, it is used to measure the distance between the eyes of the human eye and the height of the pupil to the bottom of the lens. Detailed product description: 1. the instrument adopts the precise optical structure, the optical path is clear and the measurement is accurate. 2. the operation is simple and the measurement speed is fast. Parameter Net weight: 0.2 kg Packing size: 23 ( l ) x 10.5 ( w ) x 5 ( h ) cm