Sell The Blue Light Glasses Spectacle Lens Test Card Tester computer Lenses Kad Ujian Cermin Biru 防蓝光眼镜测试卡 1pc best price

Package included; 1 test card （1 张测试卡） The test method is as follows; 1. Turn on the test light and irradiate it on the test area of the card,the test area turns blue and purple. The blue and purple color will disappear in about 20 seconds and then the test card can be used again. 2. Put out blue light blocking glasses on the test area, irradiate it through the lens, the test area will not change color as the blue ray had been blocked effectively. 测试方法： 1。打开测试灯，对准卡片测试区照射，变色为蓝紫色。 2。使用防蓝光镜片放在测试区，通过镜片照射不变色，蓝紫色被阻隔，为正品防蓝光镜片 Note: 1. Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. 由于光线和荧幕的不同,物品的颜色可能会有些偏差 2. The measurement allowed error is +/- 1-3cm请允许因手工测量而产生的+-1-3厘米差异