The AMADA MM-410B Weld Tester is a portable, handheld device engineered for superior quality control in resistance welding, featuring ISO17657-compliant measurement capabilities. It precisely measures critical welding parameters such as current, voltage, welding time, and force. A key technical highlight is its enhanced accuracy, utilizing a dedicated ISO17657-compliant toroidal coil for RMS calculations over the entire current flow time, alongside conventional arithmetic mean RMS. The tester supports AC/DC seam measurement for up to 5 minutes, accommodating current/voltage in AC welding and voltage in DC welding. Its versatility extends to various welding machines, including single-phase AC, DC inverter, AC inverter, and transistor types. External input functions enable the display, measurement, and OK/NG judgment of externally sensed parameters like temperature or air pressure via ±10V or 4-20mA inputs. The device presents up to 10 measured values and 4 waveforms on a 5.7-inch color touch panel, offering intuitive OK/NG judgment. Data storage includes measured values and waveforms saved to built-in flash memory or external USB, with communication via USB and Ethernet for both unidirectional and bidirectional data transfer. Specifications detail current and voltage measurement accuracies of ±1% full scale across multiple ranges (e.g., 0.1-200kA for current, 0.3-20.0V for voltage), and force accuracy of ±3% full scale. The compact unit (224x47x157mm) weighs approximately 0.9 kg and supports multiple languages.