Description:The control panel of the spot welding machine is a controller that is independently developed for DIY or simple resistance welding. The principle of phase tripping controlled by silicone is applied to adjust the time and current to achieve the purpose of welding. Features: All-digital circuit, new zero pass detection circuit, accurate current and time control. Compatible with 50HZ and 60HZ power supplies, the controller automatically evaluates. Current adjustment range 30%-99%, time control within 1-99 cycles (1 cycle=20ms).2pcs 0.56-inch high brightness digital tube-shaped. Press the button to adjust the parameters, the operation is more convenient. The display panel includes status light and buzzer, the instructions are more intuitive. Easy to install, convenient for customers to install and produce spot welders. Specification: Optional Type: 1# 40A, 2# 100A Control Board Size: 50x80mm(1.97x3.15in) Display: 50x100mm(1.97x3.94in) Color: As pictures shown. Quantity: 1 pc Note: Transition: 1cm=10mm=0.39 inchNo retail package. Please allow 1-3mm error due to manual measurement. Pls make sure you don't mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Included: 1 x Control Board with Display (Other accessories demo in the picture are not included.)