Ordering a custom IoT PCB sounds simple until you're staring at a quote request form full of fields you've never had to fill out before. Layer count, copper weight, surface finish, impedance tolerance — miss one, and you either get a board that doesn't work or a manufacturer who has to stop production and call you for clarification, burning days off your timeline. Whether you're building a smart home sensor, a wearable, or an industrial IoT node, the specs you hand your PCB m