Small and portable handheld device with onehanded control. Lightweight design makes it easy to hold and pocketable for onthego use. Hidden auxiliary module with a onepiece detachable design. Convenient, fast, and uncluttered for quick setup and use. Network test capability. Automatically scans and detects the of the network cable, enabling efficient verification without manual steps. HD display with clear readings and an integrated LED lighting function. The LED flashlight provides illumination for working in dark environments. Use scenarios Onsite network installations and maintenance: quickly verify cable and identify miswiring in office, data center, or lab environments to reduce downtime. Home networking and troubleshooting: confirm Ethernet cable wiring before connecting devices, speeding up setup and fault isolation. Lowlight work conditions: use the builtin LED light to illuminate cables and connections during installation or in dim spaces such as server rooms or crawl spaces.