Looking for instrument (TPUS),(RPM) and (PBM)

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Hi everyone
I’m doing research in using power in classroom, I been searching for these instrument for couple of weeks. It is very famous tools to measure power.

Do any one has an idea where to find or has a copy.

· Teacher Power Use Scale (TPUS)

· Relative Power Measure (RPM)

· Power base Measure (PBM).



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