Exposure Meter, also known as the light meter. A meter that measures the intensity of light during photography and controls the exposure time and aperture size of the photograph. A device used in photography to determine the correct camera lens and shutter settings. There are two basic exposure meters: one for the battery and one for the other. Most exposure meters measure reflected light (light reflected from the object to the camera); some exposure meters measure the incident light, the light actually projected onto the object; others can measure both types of light. The flash meter measures the output of the electronic flash. Some photographers use handheld watches, but camera built-in watches are more common. Many built-in watches are mounted behind the lens. In an automatic camera, the built-in watch sets the lens aperture, flash speed, or both. In a non-automatic camera, the photographer himself reads the watch as a reference for manual setting.
Residual Current Circuit Breaker
RCCB named Residual Current Circuit Breaker. When there is human electricity shock or if the leakage current of the line exceeds the prescribed value, Residual current circuit breaker/RCCB(without over-current protection) will cut off the power rapidly to protect human safety and prevent the accident due to the current leakage. The rccb switch which made from Korlen electric can be used as infrequent changeover of the line in normal situation.
Korlen electric ---- the rccb switch manufacturer,produces types of Residual Current Circuit Breaker. It is applicable to industrial site, commercial site, tall building and civil house.
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