In the ____ Storage Oscilloscope signals can be stored. 

• Digital storage oscilloscope is an oscilloscope that stores and analyzes signals digitally instead of analyzing in analog form.
• It has an advanced trigger, storage, display, and measurement features. 
• In it, the analog signals to be analyzed are sampled and quantized and the digital data is stored and analyzed for signal amplitude and time period.
• It can analyze all kinds of waveforms like a sinusoidal, triangular, sawtooth, square wave, etc.
• The principal advantage over analog storage is that the stored traces are as bright, as sharply defined, and written as quickly as non-stored traces.
• Traces can be stored indefinitely or written out to some external data storage device and reloaded when required. 

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​VTVM: The voltmeter that uses the vacuum tube for amplifying the measurand AC and DC voltage is known as the vacuum tube voltmeter (VTM). The vacuum tube increases the sensitivity of the voltmeter because of which it can detect the signal of very weak strength.

CRT: The cathode-ray tube (CRT) is a vacuum tube that contains one or more electron guns and a phosphorescent screen, and is used to display images. It modulates, accelerates, and deflects electron beam(s) onto the screen to create the images.