FIELD: road signs and markings.
SUBSTANCE: device comprises light-tight housing, light source, device for positioning the specimen to be tested, light receiver, and light splitter. The device has additional control channel whose axis is in coincident with the image of the axis of the main channel in the light splitter mirror. The housing of the device is provided with the viewing opening located at the axis of the control channel. When the device is adjusted, the opening is open, and when it operates, the opening is closed.
EFFECT: enhanced precision.
5 dwg
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