Features: Use of high-speed single chip microcomputer to do voltage sampling test, and drive the LED lamps display voltage, realize the integration of board and card, reduce the defect rate. 0-300V adaptive voltage, suitable for most series and parallel bead test. When testing, the use of gradual starting modes, voltage automatically adapt, current gradually increase, never burn lamps beads. Digital display real-time voltage output, with adjustable voltage, voltage value can be corrected by itself. The digital meter uses green luminescence tube, the display of 00 is short circuit, the display of 300V is open circuit. Each group of LED strip of the same LCD TV display voltage should be the same. Hot and cold isolation, never electric shock. Power cord and box integrated design, easy to carry out. You can light up the LCD TV screen without dismantling the screen. Specifications: Material: Plastic Input: 85-265V Output: 0-300V Power: 18W Size: Approx. 180x105x40mm/7.09x4.13x1.57in Color: Black/Red Type: AU-/US/UK/EU- Note: When you are unsure of the positive and negative electrodes, use 19V voltage to detect the positive and negative electrodes. Do not use 300V voltage to detect derectly. The 300V voltage may cause damage to the device. During the test, do not look directly at the lamps bead due to the highlighted version. So as not to hurt the eyes. Package includes: 1x Lamps Bead Tester