Handheld, Modular, and USB Oscilloscopes are versatile electronic test instruments designed for industrial and field applications. Handheld oscilloscopes offer portability and ruggedness, ideal for on-site diagnostics. Modular oscilloscopes provide customizable configurations for specialized testing needs. USB oscilloscopes leverage computer connectivity for compact, high-performance measurements. These tools are widely used in automation, telecommunications, and power electronics for real-time signal analysis and troubleshooting.