Like anything else, there are different grades of instruments with corresponding costs, so the task of the specifier is to separate the needs from the wants, and to balance the performance with the costs. With an awareness of some of the basic considerations and of instrument grades and selection criteria, good decisions are usually evident. Leaving the instrument selection entirely up to the vendor may or may not be the best approach. To the extent that the 'standard offering' instrument portfolio has good performance, this can save money, however a review of the proposed instruments is advised just to be sure. When reviewing product literature for instrumentation, like any other equipment, it is often as important what is not said, as what is said on a component specification sheet. For example, if long term drift is not mentioned, ask yourself "why is that?"

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