Final answer:
To test the strength of a muscle through available ROM using different +/- methods, you should use the Manual Muscle Testing (MMT) scale.
Step-by-step explanation:
If you want to use +/- other than Kendall or want to precisely test the strength of a muscle through available ROM, you should use the Manual Muscle Testing (MMT) scale. The MMT scale is used to objectively assess and measure muscle strength and function. It involves applying resistance against an individual's muscle contraction and grading their ability to overcome that resistance. In reference to the bathroom scale scenario that is described, if you suspect the scale cannot accurately measure weight to within a pound, you would use a calibration test or a series of accuracy tests to determine its precision. For these tests, you would compare the scale's readings with known weights and record any discrepancies to assess the scale's true level of accuracy. In a clinical or research setting, adherence to proper testing protocols would be essential to ensure validity and reliability in the results.