Tuners are a crucial part of any guitar players equipment. The strobe guitar tuner has LED lights on the device which indicate your note by blinking (thus the strobe effect.) Strobe tuners are able to display the note by the lights behind a spinning disk. In the mechanical strobe tuners this disk is set to the note you desire and the lights blink with the sound being input. There are both electric and mechanical strobe tuners out on the market. Here, you can learn to strum acoustic guitar if you're curious. The advancements in technology have allowed digital tuners to present themselves as well. Even with the several different types (and prices) of tuners, they all work very similarly.
The sound is input, either through a microphone or directly into the device. These sounds create vibrations that the machine reads and outputs as the notes. In the mechanical strobe tuners this sound is translated into the blinking lights. In the digital devices it is translated to the screen. These devices range in size and complexity, but they all do the same thing. They allow a guitar player to find the perfect pitch for whichever string they are playing.
The benefit of the strobe guitar tuner is that it allows you to customize your tuning. Since these machines are programmable, musicians are able to get their sweet spot very easily. This is because of the mechanics inside the tuner. The blinking indicators can be adjusted to align with the exact sound you are looking to get. Strobe tuners are able to find every half step and in between note a guitar player could want, get some great examples here.
The best way to describe a strobe tuner is that it translates the sounds coming out of the guitar into light. The strobe tuner is extremely precise. This is the best way for a guitar player to actually see the sounds.