When choosing a calibration provider we must first consider our own needs. Both technical and commercial requirements should be taken into consideration.

• Do we need an internationally traceable calibration? What parameters do we want to have calibrated? What level of measurement accuracy do we require?
• Do we want the measuring instrument calibrated as a whole in terms of limit values? Do we need a declaration that the measuring instrument complies with the requirements?
• Which parameters need to be calibrated to ensure that there will be a strong likelihood that the measuring instrument as a whole complies with the requirements?
• Do we need a complete solution?
• How clear do we want the laboratory reports to be?
• Do we need the adjustment and/or repair of the measuring instrument?

Technical regulations defining the parameters for a complete examination of measuring instruments are only available for very limited categories of measuring instruments (Decree on Types of Measuring Instruments for Which Type Approval and Verification is Mandatory). For some types of instruments (e.g., oscilloscopes, signal generators, spectrum analysers, etc.) there are quite general standards which, in terms of calibration procedures, can be interpreted in many different ways. There are, however, also some standards for instruments (e.g., EMC receivers, sound level meters, accelerometers, etc.) which quite specifically determine the calibration procedures.

For the majority of instruments in the field of electrical quantities, there are no sufficiently tangible guidelines for their calibration. Apart from general knowledge in the fields of metrology and maintenance of measurement standards, a calibration laboratory should also have knowledge and skills in the fields of construction properties and the intended use of individual categories of measuring equipment. A laboratory should combine these skills with the manufacturers' recommendations, where available, and relevant general documents (standards).

Commercial considerations refer mainly to the price (what do we actually get for the money?), flexibility with regard to the date of calibration and the time required for its performance.

Our laboratory provides calibrations of different types of measuring instruments and at different required accuracy levels, at a reasonable price, while assuring international traceability and comparability. In line with international trends, we wish to make a traceable calibration accessible to everyone.

In general, the price of calibration depends on all of the inputs necessary to establish the service, and on the volume of work within a specific category of measuring equipment. The price increases with the required level of accuracy (measurement uncertainty) and the complexity of measurements.

On the whole, the price of calibration in Slovenia is lower than, or at least comparable to, the price of calibration in other EU member states.