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Monitor/TV refresh rate meter:

obviates eye strain

Monitor/TV refresh rate meter:
The field frequency of a computer monitor or TV screen is a compromise between the requirement for as many horizontal lines as possible and the avoidance of flicker. Such brightness, luminance or colour fluctuations if fewer than 25–30 per second may cause eye strain and headache. It is often possible to increase the field frequency and so prevent such discomforts. The meter described in this article enables the field frequency to be determined.
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