The phrase "a valuable instrument" is correct and commonly used in written English.
It refers to something that is useful or important for achieving a goal or completing a task. Example: "The microscope was a valuable instrument in discovering the cause of the disease."
The proposed method is a valuable instrument for the study of degradation processes in polymers.
Burned area maps are a valuable instrument for designing prevention and recovery policies.
We demonstrate in this paper that glow-discharge optical emission spectroscopy is a valuable instrument meeting these requirements.
Prosecutors have described the law as a valuable instrument against corruption at a time when officials have become increasingly sophisticated at covering their tracks.
The Ratan-600 is a valuable instrument for collecting weak signals from larger areas of the universe than most telescopes can study.
In this context, the Argo programme (http://doi.org/10.17882/42182) is a valuable instrument for monitoring the deep sea at global scale in space and time.
The scale has been validated using psychometric analyses, with the conclusion that the S-MMSE is a reliable instrument and a valuable tool for assessing cognitive function [ 55].
Despite the aforementioned shortcomings, this instrument is a valuable tool for capturing the competency of primary care manager in Thailand and serves as a starting point in how to measure SHPH-Ds competency.
Odysseus, in particular, knows that "one who could distract the people in this way, turn them from discontent and the breeding of revolt, was a very valuable instrument, especially at a time like this".
[ 2] HRQL instruments provide a valuable tool to assess the impact of disease, effect of treatment and other variables affecting people's lives.
This survey instrument may be a valuable tool to monitor hospitals' efforts and success in doing so.
