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The goniometer is used to measure the angle of any abnormal head-tilt or an abnormal position, different from the vertical or horizontal position.
There is a center fixation light with an on/off switch on the power supply. Length of each wing: 120 cm Width of each wing: 11 cm
Special slotted scale allows very accurate monocular measurements. Standard mm scale on the top edge with a pupil diameter identifier at the opposite edge. Stainless Steel.
PD Ruler, plastic, with mm scale