From the entire pool of test equipment available at our disposal as electronics engineers and technicians, the most useful is undoubtedly the oscilloscope.
What does an oscilloscope measure?
Five Things to Look for When Choosing an Oscilloscope
Oscilloscope and Dmm doesn't match - General Electronics - Arduino Forum
How to Choose an Oscilloscope for Circuit Design
A new cost-optimized high-performance oscilloscope - EDN
Frequency Response Measurements with Oscilloscope
A Day for Oscilloscopes - News - SparkFun Electronics
Tips: How to Select an Oscilloscope Before you Buy - Part I
Electronics Laboratory Equipment List Essentials, Advanced PCB Design Blog
DLM5000HD Series High-Definition Oscilloscope