Features: 1. This tester can test all sizes of CCFL luminaires, ranging from 3 to 55 inches. 2. Ergonomic high voltage point measurement quality standard. 3. The ground wire has a plug connected to the tester and an alligator clip at its other end. 4. You can test all CCFL tubes and take care not to create high voltage arcs that can damage the tubes. 5. Very easy to test LCD screen, CCFL advertising signs, etc. 6. The red button switch is safe. Connect the 12V DC adapter (not included) to the tester and the LED will be green indicating that the power is ready. The top of the tester will have a high voltage, when the LED turns red (indicating alertness), press the button, then you can test the light. The LED will turn green (sleep) by pressing for 3 seconds. 7. Scope of application: bare lamp, lamp with bracket, LED light bar, LCD backlight detection, LCD TV backlight detection, LCD maintenance display channel detection. 8. Applicable industry: appliance repair personnel, LCD maintenance personnel. Specification: Input: DC 12V 2A Suitable for: 3-55 inch TV Material: Plastic + Metal Color: Blue Size: 18.5 * 3.8 * 2.8cm / 7.3 * 1.5 * 1.1in Weight: approx. 94g Package list: 1 * Tester 1 * Null Line 1 * Connection Cable Note: 1. Do not connect the lamp to the tester for long time. Always make sure contact the probe tip to the ending of the lamp to be tested. 2. Be careful not to be hit y high voltage.