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3.2 Description of rear panel
Fig.3
B1. Battery Lid
Move the lid parallel to change batteries.
B2. Electronic Panel
B3. Monocular Covering Knob
The covering of the testee's right or left eye will be realized by
turning the knob.
B4. Compensating Ocular Key
Sliding the key can make a +2.00D compensation for the diopter of
eyes.