It is the most convenient and practical measuring instrument. It is clean at one glance to anti-UV transmissivity. UV data by light showing and LCD screen, Adjusting knob has Makes the measured value more accurate. First, put the standard lens on the outlet of UV light, adjust the knob to make the value on the LCD screen the same as the value of the standard lens. For accuracy, you have to calibrate the value with the standard lens.
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