It's not disagreeing with me, it's disagreeing with the very people that set up the testing/calibration procedure/requirements, and they are very much the same with regard to whatever country you happen to be in.
As far as i'm, aware there has to be a set of given parameters at the time of calibrating which includes a controlled environment for both testing kit and the test kit under test!! Now anyone that set's up a mobile calibration service is not going to be able to provide any form of controlled environment for either his own test equipment or indeed yours. Now all these jokers state that all tests conducted to this standard or to that, when in fact they can't meet any recognised standard. Basically any cert they issue is a fraudulent cert!! All ''recognised official certs'' will include somewhere on that cert, environmental conditions at time of test, if it doesn't it's a buckshee cert, if it does then it's a fraudulent cert....
It doesn't matter what environment YOU use your test equipment in, that is entirely up to you. We are talking about the conditions at the time of calibrating the test equipment...