· QUALITY GUARANTEE Each universal circuit board is carefully inspected before being put up for sale. us if you have any problem with our product· Easy Soldering The universal circuit board is -through treated for easy welding and longer life.· Ideal for building a prototype electronic circuit board· FOR DIY SOLDERING This universal prototype PCB circuit board is double-sided tinned and used for point-to-point DIY soldering.· Quality Assurance: As a professional seller, high quality products and services have always been what we stick to. Every product has passed the quality inspection before leaving the factory. Please confirm whether the product is suitable before purchasing