Practical and costeffective handheld oscilloscope designed for the maintenance and research education industries. Realtime sampling rate: 2.5 MS/s; bandwidth: 200 kHz; trigger functions include single, normal, and automatic for flexible event capture. Compatible with both periodic analog signals and nonperiodic digital signals, providing broad testing capability. Onekey AUTO enables immediate waveform display without cumbersome adjustments, saving setup time. Handheld, portable form factor suitable for field service, workshops, and classroom use. Use scenarios: Onsite maintenance and equipment : diagnose and verify electronic circuits in appliances, control panels, and other devices. Education and training: demonstrate signal behavior and timing concepts in classroom or lab settings. Prototyping and debugging: observe and troubleshoot microcontroller and mixedsignal projects during development. Performance and design notes: Compact handheld design supports portable operation without sacrificing essential waveform observation. Functionfocused interface supports reliable measurement with straightforward operation.