Features: 1FOR TV REPAIR: Can test the backlight brightness of TV LED of any size, and can judge the quality of backlight strip without removing the screen. 2SAFE OPERATION: Soft start mode is adopted, the current gradually increases, and the voltage is automatically adjusted to prevent electric shock. 3APPLICABLE DEVICES: Compatible with most LED backlight screen, such as television, computer, mobile phone, navigator, etc., unlimited in times. 4APPLICABLE LAMP TYPE: Safety monitoring single LED lamp bead, lamp panel, lamp string and integrated light source, etc., without any other test. 5EASY OPERATION: The backlight tester is small and portable, equipped with test pen and power cord, and can be used in various test scenes. Package included: 1 x Light Tester 1 x Black Test Pen 1 x Red Test Pen 1 x Power Cord 1 x User Manual