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Learning Tools

Arduino

Open Source Hardware Project. 

Mindstorms

Lego's!

There are several projects that link the 2 platforms via i2c, a standard hardware communications protocol.

Oscilloscope:
Makes Electrical Waveforms Visible in both the Time Domain(Signals changing with time) and Frequency Domain(Signals changing in frequency)

Multimeter:

Measures: Static(not changing) Resistance, Voltage and Current