Upgraded Version handheld digital oscilloscope ARM CortexM3 processor (STM32F103C) and a 4inch color TFT display deliver improved performance and clearer visualization. Easy operation with included instructions; suitable for both beginners and experienced users. Auto, Normal, and Single trigger modes enable quick and reliable capture of momentary waveforms. Precise measurements with rising and falling edge trigger plus negative delay to view data before the trigger. The HOLD function lets you freeze and inspect waveforms at any time. Portable handheld design with a bright 4inch display for field testing or bench use, offering reliable performance for a range of signal measurements. Practical use scenarios Debug microcontroller projects by capturing PWM signals and digital timing events to verify timing relationships. Diagnose sensor and motor control signals in embedded systems with flexible trigger options and pretrigger data. Use in educational labs to teach waveform analysis, triggering concepts, and realtime signal observation. Key attributes Function: handheld digital oscilloscope with trigger options and pretrigger observation Size: portable handheld form with a 4inch color TFT display Performance: upgraded ARM CortexM3 based processing for smooth visualization and responsive operation Accessibility: designed to be easy to use for beginners while still meeting the needs of experienced users Visualization: clear display to enhance waveform visibility and measurement accuracy