Education of the republic of uzbekistan tashkent state technical university named after islam karimov

Accuracy 
* Standardized metrological characteristics of the device. 
* Device design - design features that reduce basic and additional errors. 
* Features and characteristics of the measuring element included in the device. It is a 
measuring element that has a major impact on metrological characteristics. 
* Software that provides the features of the accuracy of the device and its capabilities 
(systemic and additional errors). 
* Special requirements for the operation of the device. Often, the equipment can incur 
additional financial costs i.e. it must be used under special conditions. For instance, it may have 
a separate foundation or the room may need particularly high quality insulation. In such cases, 
the choice of a more expensive device with high metrological properties may be economically 
reasonable, so that additional errors (temperature, humidity, vibrations, etc.) resulting from the 
operating conditions can be minimized. 
* The weight and dimensions of the device, as well as the requirements for the 
workplace - the required area, ceiling height. Often there are cases where purchased devices do 
not pass through the laboratory door. It is important to take into account the requirements for 
the conditions of transport and movement of the measuring instrument. 
* Power supply, lighting, and vibration requirements. 
Efficiency 
* Device design features that reduce measurement time. For example, an extended 
measurement ranges, a more efficient measurement method, and etc. 
* Availability of software in understandable languages (for example, in Russian or 
Uzbek). Mathematical re-processing of measurement results, and to formulate the ability 
protocols in accordance with the requirements of standard or measurement methodologies. 
* Availability of user manual in the official language. 
* Functions of the device that allows performing basic and possible additional tasks. 
* The delivery area should be large enough to use the device. To have possibility to 
order the necessary additional items (including spare parts and accessories) in the future. 
* Easy operation of the operator on the device. 
* Self-metrological monitoring and correction.