What are the principles for selecting different instruments?
There are two areas for your reference1, the actual needs of the measurement, must meet your needs2, cost, with the least cost
The technology in the choice of instruments for the measurement of the maximum permissible error, usually should be required as the measuring object error of 1/3 ~ 1/5, if the condition does not permit, but also for 1/2, of course at the confidence level of measurement results on the corresponding decline.In choosing the measuring range of the measuring instrument, the upper limit shall be not the same as the measured value, and the total value shall be covered.
The measuring instrument from technology and economy of the metrological characteristics (such as the maximum allowable error, stability, measuring range, sensitivity and resolution etc.) properly meet the predetermined requirements, it is necessary to be enough, but not too high.
