| 摘要 |
An infrared measurement method and device is described having light projecting target sighting means. Changing the sighting display controls brightness of the sighted target. Automatic brightness control of the target is provided by a light sensor and/or according to target distance. Switching the display light into different patterns changes brightness, which is also changed by changing the electrical supply to the sighting light and by optical attenuation of the sighting light.
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