"effective instrument for" is correct and usable in written English.
You can use this phrase to indicate that one thing could be used to achieve a particular effect. For example, "The use of visual aids is an effective instrument for communicating complex ideas."
And there is no more effective instrument for disseminating ideas to a broad public audience.
A union of 25 member states seems incapable of being an effective instrument for coordinated policy.
Harlan became an effective instrument for Goebbels's beliefs in the power of cinema.
The historian Carl Boyer called the calculus "the most effective instrument for scientific investigation that mathematics has ever produced".
Multilateralism is the most effective instrument for promoting peace and security and winning the fight against poverty, disease, drug trafficking and environmental degradation.
"We will spare no effort to make the United Nations a more effective instrument for pursuing all of these priorities," a declaration issued today said.
But because they are the visual language we use to photograph our own families and friends, they proved to be effective instruments for Mr. DiCampo.
"I found that questions are probably one of the most effective instruments for oversight," Mr. Dingell said, relishing the word "effective" and seeming to suck it through his teeth.
Learning environments have proven to be effective instruments for developing competence in manufacturing training and education.
In the last 50 years, natural early-warning signals were shown to be useful and effective instruments for the safeguard of human lives: For instance, the high toxicity and persistence of dichlorodiphenyltrichloroethane and polychlorinated biphenyls were identified in such way [53, 54].
As imaging techniques were not available for a diagnostic approach in the disaster area, medical history and accurate general and neurological examinations represented the most effective instruments for a correct diagnosis and exclusion of life-threatening conditions.
