The Signal Fire OTDR ZS1000-A/B (Optical Time Domain Reflectometer) features six key functions: OTDR, intelligent optical link analyzer, optical power meter, stable light source, red light source, and LED flashlight. It boasts a dynamic range of 20dB, a measurement range of 100m-80km, an attenuation blind zone of 12m, and an event blind zone of less than 3m. It features a 3.5-inch full-color HD touchscreen and a 2000mAh lithium battery, making it compact yet powerful. The Signal Fire OTDR utilizes the backscattering generated by Rayleigh scattering and Fresnel reflection during optical fiber transmission. This precision optoelectronic integrated instrument is widely used in optical cable maintenance and construction, capable of measuring fiber length, transmission attenuation, connector attenuation, and fault location. It features one-touch automatic testing, easy operation, and a handheld design for portability. High-speed signal processing shortens test times and enables rapid analysis. It can store 8,000 sample points and has a Type-C connector. User-friendly OTDR simulation software displays event details.