Features: The B333 Telephone Test Set delivers precise line fault detection with advanced circuitry analysis, enabling telecommunication professional. Durability ABS construction and impacts resistant housing, this line testing device features intuitived button controls and a clear LCD display For engineers, networking maintenance technicians, and infrastructure installation crews requiring efficient troubleshooting tools s. Ideal for diagnosing office networks, verifying cabling integrity in server room,and maintenance checks during telecommunications upgrades. This multifunctional line tester combines continuity verification, short circuit identification, and voltages measurement capabilities complete with overloads protections for safe operating. Specifications: Component: ABS, durability and impacts resistance. Size: 165x50x30mm/6.5x1.97x1.18in Support：Double standard caller Cable Type: Duck billed line/Clone line/Clone and duck billed line Optonal Widely used in the installation, maintenance and troubleshooting of telephone lines, suitable for use by technicians, networking engineers and other professional. Package Includes: 1Set B333 Telephone Test Machine note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.