Voltage Test 1mA/30mA Convertible LED Backlight Tester Screen LED LCD TV Back Light Tester Meter Lamp Beads Light Board Test Strip Bead Diode Testing Repair Tool  Portable LED tester for testing LED TV backlight, strip light, LED panel, COB, lamp bead, diode, etc. Come with a pair of test probe. Features: Can be used to test LED TV(any size) backlight,there is no need to remove the screen when testing LED backlight. You can find the LED strip problem easily as you do not need to disassemble your LED TV to test LED strips which can save a lot of time for you. Automatic recognition of LED polarity, adaptive test of lamp bead, strip & backlight and it won't not burn lamp bead. High brightness, no need to separate screen to judge whether a backlight strip works well. Automatic adjustment of output voltage and current.  Notes 1. Please disconnect the power of the detected object first. (If you use to test TV backlight,you should make sure the LCD screen is powered on.) 2. When testing,use the red and black pen to touch the anode and cathode of the LED lighr respectively. The  light will automatically change from slight      brightness to high lightness gradually(3~5S) and then stabilize. If you don't want  too-high lightness, remove the pen in proper lightness. Repeat the        above preocess in the next testing. 3. When testing, the voltage displayed=open circuit voltage, indicating that the tested light bar is inversely connected or there is open-circuit fault. 4. When testing, the voltage displayed=00.0, indicating that the tested light bar or the lamp bead short-circuits. 5. When testing two subjects without electrical connection, if the voltage displayed is lower than the open circuit voltage,it indicates that there is electric     leakage between the two subjects tested. 6.Suggest 1mA except the TV back-light testing. 7.The voltage should be 0.00 when the two probes touch each other. Specifications: Plug Type: US Input Voltage: AC 85-265V Output Voltage: DC 0-320V  Output Current: 30mA (Voltage 0-320V, for TV testing), 1mA (Voltage 0-22V, for small components) Package Size: 20.5* 14*4cm / 8.07 * 5.5 * 1.57in Package Weight: 277g / 9.77oz    Package List: 1 * LED Tester 1 * Pair of Test Probe 1 * Power Line 1 * User Manual