Hello. Does anybody knows how to read a calibration certificate for thermo hygrometer? I understand that Measurand mean reading is from the device being tested and standard mean reading is from the standard device. If for example, the measuarand mean reading is 21.0 deg Celsius and the standard mean reading is 20.4 deg Celsius. Ans the correction is -0.6, and the uncertainty of measurement is +/- 0.70.. What does it mean? I'm really sorry if my question seems simple enough for most of you but I'm really having a hard time explaining this to my superiors. Thank you for your time and understanding.