No written reference for components other than the resistor color code. If a person can read a circuit and see subtle color markings on small components, then resistors are for you. I'm sure a person could find component codes online, but unless you know what you're doing or are impatient I wouldn't buy this. As an adult I bought this to learn and play with electronic components. I suggest if you buy this one try to get a better organizing set than this little box.
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