Size: 21.3x5.6x1.5mm, millimeter distance of measuring range: 20mm~40mm on each side, complete PD is between 40mm and 80mm.
You can easily use the eye mask function to cover your eyes for vision testing, and use the ruler function to determine the pupillary distance.
Ideal for our care providers, opticians, eyeglass manufacturers, etc. to provide as gifts to their clients.
Allows you to use your right or left hand more conveniently and comfortably. At the same time, this product can also be used to measure replacement eyeglass frames.
Plastic material, light weight, can be used for a long time
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