Specifications: This is Ultraviolet ray measurement of the optical lens. It is very useful to every optical shops and opticians as a basic measurement. For safety human eye, you should check the lens first before making glasses. Simply using, easy checking and result! Just one time click! How to use - Check all contents are ready. - When checker is turning it on, the 7-segment(Digital figures) should be showed 100 and LED-BAR is on. - LED light is turning off automatically after 2~3 seconds and 7-segment(Digital figures) shows 000. - Put the lens on the center of checker. - Press the cal 1~2 seconds for the checking of UV-measurement. - UV lamp is on and electric current go to timer to supply it\'\'s cycle frequency to CPU - Checker shows the measurement value of UV on the 7-segment(Digital figures) and LED-BAR about 10 seconds. Specification - Supply voltage: AC 85V ~ 264V(50~ 60Hz) - Power voltage: PC 5V(15W) - IC voltage: DC 5V - Length of lamp: About 200.000 movements. - Power consumption:15W~20W - Size:160*(L)121*(H)84mm