1.0 Introduction to Measurement
In order to perform reliable measurement the user evidently should have proper measuring devices. In turn these measuring devices should be calibrated at regular intervals. To measure is one thing, to measure correctly is something entirely different. To obtain result a number of questions must be answered:

• What specific property is to be investigated?
• In what unit will it be measured? (The results of the measurement will be quantified in units, therefore using the right unit is essential.)
• The measurement method that will be used. (In this respect measurement procedure, error analysis and possible external influences could be importance.)
• The measurement setup. (Such a setup will always contain a standard, a measuring device and the instrument to be measured. For accurate measurements quality devices are required. To be able to determine whether a measuring device is in good condition, it is necessary to check it at regular intervals. )