Only from the cost considerations, in accordance with the method of calibration calibration of your plant's instruments, then you have to strictly in accordance with the calibration procedures to do that, then first of all, you need to buy the regulations require the measurement of the standard apparatus and more than one, and secondly, you must be out of school every year these measurement of the standard apparatus, the calculation of the cost of your cost than you send out of the cost of the school must also be much higher than the cost of the go, why bother?
Calibrators can follow the calibration specification to do, there is no calibration specification can be part of the reference calibration procedures to do, but also according to the actual situation of their own internal use of the calibration specification, so that the cost is much lower.
In fact, whether it is a checker or a calibrator is basically not the most cost-saving certificate! The most cost-effective is the internal calibrator certificate!
The most cost-effective is the internal calibrator's certificate of competency.