The AMADA MM-601B Force Gauge is a handy and high-accuracy instrument specifically engineered for quality control in resistance welding applications. This portable, handheld device, weighing 500g (including nickel-hydride batteries), utilizes a load cell for precise force measurement, allowing it to be easily carried and used anywhere within a production site. Its compliance with RoHS standards also ensures ease of international export. Operationally, the MM-601B boasts a user-friendly design with only four buttons, offering switchable measurement units between kilograms (kg) and decaNewtons (daN), and a convenient single-button zero adjustment. The unit is robustly constructed with a cover panel providing excellent dust and oil endurance, ensuring reliability in industrial environments. From a technical perspective, the MM-601B supports a broad measurement range of weld force, from 0.20 daN up to 931 daN (or 9310 N when paired with the MA-522-01 sensor), achieving a measurement accuracy of +/- 5% of full scale. It functions with a series of separately sold force sensors (MA-520-01, MA-521-01, MA-522-01), automatically identifying the connected sensor type. A crucial feature is its external input for measurement HOLD, which automatically captures and displays the peak weld force upon activation of a micro switch on the weld head. Additionally, an analog output terminal enables connection to external measurement devices such as oscilloscopes. This functionality provides valuable visual data on weld force timing, which is instrumental for setting optimal initial squeeze times in welding processes. The device's display automatically adjusts decimal points and units, provides clear overload warnings ("OVER!!"), and alerts for low battery, further enhanced by an auto-power off function to conserve power after periods of inactivity. Power is supplied by four 1.2V nickel-hydride batteries or an AC adapter, ensuring continuous operation.