1) All-in-one functionality: The mini 4-in-1 Fiber Optic Cable Tester combines optical power measurement, wavelength testing, wiring diagnostics, red laser functionality, and crimping testing in a single compact device. It is equipped with a powerful laser head for enhanced penetration and precision. 2) Accurate optical power measurement: Professional optical power meter measures from -60 to 8 dBm with an accuracy of ±5%. Supports 850/980/1270/1300/1310/1490/1550/1577/1625/1650 nm (10 wavelengths). REF accuracy: 0.1 mW. Automatically identifies optical power frequency with built-in protective features for safe, reliable operation. 3) Versatile testing applications: Multifunction optical power tester with RJ45 crimping testing; ideal for evaluating optical transceivers, receivers, modules, and RJ45 network connections. Provides comprehensive diagnostics for fiber optic and network performance. Automatically verifies the crimping accuracy of plug connections for seamless connectivity. 4) Practical design: Integrated optical power and crimping testing tool with a split design that includes OPM, VFL, and network cable testing functions. Compact and portable for on-the-go use, ensuring accurate jack crimping. 5) Enhanced display and durability: 4-in-1 fiber optic tester with a high-definition digital screen for clear data display, complemented by an impact-resistant silicone edge for long-lasting protection.