David Jones from the EEV Blog has some good advice on selecting meters, or at least what to avoid. All the bells and whistles for the lowest price possible is not the way to go when looking for a meter. Inexpensive meters are fine for crude measurements if you are on a budget but if you need it to last and care about measurement accuracy you should stick to a meter with a good reputation behind it such as Fluke.
"Our basic idea is to model an acoustic guitar as closely as possible and then implement additional functions not available to the conventional guitar. This includes allowing the play of the guitar with sound being output to earphones, allowing for practice without disturbing others, as well as a chord-learning mechanism based on LED-signalled instructions and other functions. A close modeling would mean that we use push buttons to simulate actual depressing of strings at specific fret locations, calibrate vibration sensors to detect strumming of guitar strings, and faithfully recreate a representation of the guitar body. For the production of guitar strumming sounds, we used the Karplus-Strong algorithm that synthesizes a plucked string sound signal."
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