What is the difference between "Precision" INAs and other regular INAs?
e.g. if you check the datasheet for AD8221 it is a "Precision Instrumentation Amplifier". But for AD8421 it is "Instrumentation Amplifier" . No "Precision" mentioned here..... Make it more complicated, if you check both datasheet, AD8421 has better characteristics in noise, accuracy and errors ..etc..
The same goes for Op Amps, some are marked "Precision" and some are not.
So what make them "Precision" ?