Calibration of Plug Gauges - Tolerancing

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Morning!
I am about to start calibrating our plug gauges in house and could do with some advice please. Our company conforms to ISO9001:2015 and I have found the standard BS696:1982 online to help with tolerancing. However I have become a little confused.

For example, The plug gauge I am calibrating has the limits of Go (1.150mm) and No/Go (1.250mm). I have measured each plug and have gotten then an average reading (Go-1.1508 and No/Go – 1.2434). However reading the BS696 standard, I am unsure of what the tolerance for this type of plug gauge is i.e +/- 0.001mm etc.

Does anyone have any advice or would you be able to point me in the right direction? Much appreicated!
 

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