All-in-one compact tester with complete functions for portable use. Simple operation and easy to carry, it fits in small workspaces and on-site setups. Power options - Flexible power: can be powered by a power adapter or a 3.7V lithium battery, enabling bench or field use. Compatibility and performance - Works with an oscilloscope for precise measurements. - Enables electronic circuit test and debugging, and supports frequency characteristics and impulse response testing. - Suitable for measuring audio amplifier performance and characteristics. Key benefits - Saves space with a compact design while delivering essential test and measurement functions. - Quick to learn and operate, reducing setup time. - Flexible power support enhances portability for both lab and field work. 2-3 practical use scenarios - In a repair workshop, use with an oscilloscope to test and debug electronic circuits, confirming signal paths and behavior. - In an audio setup or studio, measure frequency response and impulse response of audio amplifiers to verify performance. - On-site field service, power with a battery for quick, portable testing of electronics and audio equipment. This device emphasizes function, compatibility, compact size, and dependable performance, providing a straightforward tool for circuit testing, debugging, and amplifier measurement without unnecessary complexity.