When your PCBs are manufactured, it is essential to you--- the end user--- that they are made to your exact specifications. At EPCB, our quality assurance program is multifaceted. We always make several samples, only they are perfectly tested, can we fabricate your order in a large volume. And this means you are ensured of getting the highest quality PCBs that are made right the first time. Besides, if you do not assign a particular requirement, IPC Class 2 will be the default. Each board also undergoes a full inspection consisting of a random sampling to determine that the holes and dimensions for each part number are within tolerance.