B4 Series VFL Pen
The B4 Series VFL Pen is a professional-grade fiber optic tester designed with a hidden laser head, adjustable light intensity, and built-in LED flashlight. It supports SC, FC, and ST interfaces, making it versatile for different testing scenarios. With a large-capacity rechargeable lithium battery and multiple charging options, it offers reliable performance, long battery life, and improved user convenience.
- Hidden laser head design auto-extends and retracts for better protection and longer service life;
- Three-level adjustable luminous power meets various testing needs with memory function;
- Built-in rechargeable lithium battery with multiple USB charging options for convenience;
- High-brightness LED flashlight enables efficient work in dark environments;
- Replaceable ceramic core structure extends tool life and reduces maintenance cost;
- Universal 2.5mm interface supports SC, FC, ST connections for broad compatibility.





- 12+ Years of Industry Experience: Established in 2013, with deep expertise in fiber optic communication.
- Complete Product Range: From fusion splicers to testers, covering all fiber optic needs.
- Trusted by Global Customers: Widely used by major Chinese operators and exported to over 30 countries.
- Certified Quality Assurance: ISO 9001, FCC, CE, ROHS certified for global reliability.
- Independent R&D and Patents: Continuous innovation with professional R&D team and patented technologies.
- Stable and Competitive: Delivering high-performance products with long-term reliability and value.
- Dedicated After-Sales Support: Responsive service team to support your business every step of the way.
Q: Are you a factory or a trading company?
A: We are a professional manufacturer with our own R&D and production facilities since 2013.
Q: Do you provide OEM or ODM services?
A: Yes, we offer both OEM and ODM services to meet customer customization needs.
Q: What certifications do your products have?
A: Our products are certified with ISO 9001, CE, FCC, and ROHS.
Q: What is the lead time for orders?
A: For regular models, the lead time is usually 3–7 working days; for customized products, it’s 10–15 working days.
Q: Can I get a sample before bulk order?
A: Yes, samples are available. Please contact our sales team for pricing and delivery.