A good oscilloscope is the workhorse tool of a EE, the only problem is they actually can cost more than your house. Just the oscilloscope probe itself can easil

A good oscilloscope is the workhorse tool of a EE, the only problem is they actually can cost more than your house. Just the oscilloscope probe itself can easily cost more than a MacBook Pro. An active probe will typically run $1/MHz, so a 4GHz probe will cost you $4k.