Difference between string which snap due to usage vs a "mis-hit"

How do you tell the difference between a string which broke from natural wear&tear vs from a "mis-hit" eg from hitting the feather?

Here are two examples - the pix(s) are pretty much self explanatory (or "clear-cut")😄

Due to wear and tear

Due to "mis-hit"

From the pix(s) you can tell the string which snap due to wear and tear has evidence of fraying before it gave way from the stringing tension.

Likewise, the string which snap due to a "mis-hit" shows some form of a clean-cut-thru before the string tension caused failure.

Yonex string chart

 

Yonex racquet chart 2020

 

Some BWF players racquet and tensions

Information is as per obtained from post on another website.

How to watch Blocked BWF games (live streaming & recent recorded games)

Enjoy!!!

or 

Youtube instructions with sample

Difffrent type of "poker"s

A "poker" is used by stringers to clear obstructions or to rotate/remove grommets from the racquet frame.

The standard poker has a smooth metal surface whilst the grommet managing poker has a rough metal surface (provides grip to dislodge the grommets) - as per the pix below. 

LHS is the standard poker and RHS is the type used for managing grommets

String Diameter Verification (SDV) - Ashaway Zymax 62 Fire

As per expected from Ashaway, the thickness of the string is as per advertised.

Apologies as not able to straighten the pix for posting