Myth that socket extensions change torque wrench readings

Your 3 foot crows foot will add as much as 1.2 feet to the length of the wrench at a 90 degree angle or to be more precise it will add Sqrt(18)-3 feet That is for a wrench with a 3 foot handle,, the relationship is for those math inmpaired is

Sqrt = Square Root

Sqrt((Handle^handle)+(extension*extension)) if it's 90 degrees

Example if the extension is 3 feet, the handle 4, the overall effective length is five.