This is a kind of fine quality spot welding control panel, which has single pulse, time and current are adjustable, simple and easy to use. Equipped with digital display, you can see the time and current directly. There are two types 9V 40A or 9V 100A for you to choose according to your demands. You can try. Features: This spot welding machine control panel is independently developed for DIY or simple resistance welding. br/> The principle of silicone controlled phase shift triggering is adopted to adjust the time and current to achieve the purpose of welding. Equipped with digital display, you can see the time and current directly, simple and easy to use. Strong and weak electricity is isolated by optocoupler, safer to use. Using high precision single bit potentiometer, to ensure reliable and convenient input. A reliable zero crossing detection circuit to ensure the accuracy of SCR phase shift. There are two types 9V 40A or 9V 100A for you to choose according to your demands. Features: Name: Spot Welding Tool Set Type: 9V 40A, 9V 100A (optional) Plug: EU/US plug (optional) Package size: 175 * 95 * 60 mm / 6.89 * 3.74 * 2.36 inch Package weight: 265g/9.35oz Packing List: 1 * Spot Welding Tool Set