如曝光指示灯的点出现在“0”下，说明曝光设置正确。
When the dot of the exposure indicator is under the "0", the correct exposure is set.
技术参数：指示灯绿色LED亮：说明产品通电正常，也说明制动液里不含有水分，制动液很好！
Technical parameters: green LED light products: battery is good and no water contained in the brake fluid, brake fluid is very good!
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