Description: 【Application】: The DMX512 Line Tester is ideal for use in live performance venues or during engineering debugging. 【Reminder】: Please ensure that the tester is used while the console is transmitting signals and avoid testing on ports outside of the signal line As each lighting console has a different refresh rate, some testers may cause LED indicator lights to flicker during testing (this does not affect normal use of the line tester). 【Product Size】: The DMX512 Line Tester measures 5cm in length and has a diameter of 2cm, making it compact and easy to handle. 【Material】: This Par Lights Tester is made from sturdy pp material, this product is designed for long term use. 【Versatility】: This DMX Signal Line Fault Test Tool can not only test signals but also independently test signal lines, making it an essential tool for anyone working with stage lighting equipment. Specification: Line tester failure tips: 1. The blue, red and green indicator lights are on, which means the signal is normal. 2. A single green indicator light lights up, indicating that the ground wire is disconnected or short-circuited. 3. A single blue indicator light lights up, indicating that the positive pole of the signal is disconnected or short-circuited. 4. A single red indicator light lights up, indicating that the negative pole of the signal is disconnected or short-circuited. 5. The red and green indicator lights are on, indicating that the negative pole of the signal and the ground wire are short-circuited. Size Chart: 5cm/1.97inchx2cm/0.79inch Package Includes: 1x DMX512 Line Tester Note: Please allow slightly errors 1-2cm differences due to manual measurement.