Handheld test monitor with 4.0inch definition screen for clear and smooth onsite video verification. Key benefits Verify image quality quickly: 4.0inch HD display delivers a clearer and smoother view to confirm camera alignment and focus on site. Save installation time: builtin network and PTZ testing tools let technicians diagnose and resolve issues without returning to the control room. Confirm compatibility and performance: supports common video codecs, 4K main stream testing, gigabit Ethernet, and multiple coaxial HD standards for broad system coverage. Core functions Display: 4.0inch definition screen for realtime viewing of camera output with improved clarity and smooth playback. Network camera image test: decode and display H.264 and H.265 streams and perform 4K main stream tests to validate camera output and recorder compatibility. Dual network ports: two 10/100/1000M Ethernet interfaces with network status and traffic display for link diagnostics and throughput verification. Serial connection support: use serial ports for device configuration and control when required. PTZ testing: support coaxial PTZ control tests, RS485 PTZ tests, and network dome tests to verify pan tilt zoom operation and control response. Coaxial HD protocol support: test and upgrade coaxial HD signals including HDCVI, HDTVI, and HDAHD. Performance and compatibility highlights Codec support: H.264 and H.265 for modern network camera testing and efficient bandwidth use. Resolution testing: capable of validating 4K main stream feeds to ensure correct stream selection and recorder compatibility. Network interoperability: dual gigabit ports and traffic display help diagnose cabling, switch, and throughput issues during deployment. PTZ and coaxial compatibility: supports both legacy coaxial HD systems and modern network PTZ cameras, enabling mixedenvironment troubleshooting. Practical applications Onsite camera installation and alignment: use the HD display and stream decoding to focus lenses, frame shots, and confirm image quality before finalizing mounts. Field troubleshooting of network and PTZ systems: identify network link problems, check stream formats, and exercise PTZ functions without carrying multiple tools. System upgrade and migration verification: test coaxial HD protocols and network streams during phased upgrades from analog or coaxial systems to IPbased recorders. Product form and usability Compact, handheld format with a 4.0inch screen for portability during field work. Intuitive testing workflow: direct access to network status, traffic indicators, codec decoding, and PTZ controls to streamline diagnostics. Designed for professional installers and service technicians who need reliable onsite verification of cameras, PTZ devices, and network links. This device combines display clarity, network testing, and multiprotocol PTZ support to simplify installation, speed troubleshooting, and ensure compatibility across common surveillance systems.