Can set 30cm, 35cm, 40cm, 50cm, 65cm, 1m, 2m, ∞ and other different vision distance gears.
2 Pcs PD Ruler for Eyeglasses, Pupillary Distance Ruler, PD Measurement Tool for Ordering Glasses Online
Vision Therapy String String 3 Meter Long Rope Convergence Training Tool
Portable Lens Measuring Instrument, Handheld Manual Focal Meter, Measures Lens Diameter 20-80MM, Measurement Range: 0-±15D, Ideal for Optical Shops and Optometry Rooms
Lightweight Pupil Distance Ruler - Accurate Optical Vernier Meter for Glasses
Desktop Polariscope Polarized Stress Meter with LED Light, Gem Identification Tool for Jewelry, Gemstones, Diamonds
