What kinds of scales does the SR test apply to?

The SR test applies specifically to nonautomatic-indicating scales that are not marked. This means that the test is designed for scales where the user must take additional actions to obtain a weight reading, rather than having the weight displayed automatically.

Nonautomatic-indicating scales require the operator to manually assess the measurement, and they are not calibrated or marked for automatic readings, making it essential to verify their accuracy through tests like SR. These scales might include traditional beam scales and balances that need adjustment by the user.

In contrast, automatic-indicating scales show the weight without any required user intervention. Digital scales often fall into this category, as they typically provide automatic readouts. Mechanical scales, when marked, generally fall under a different category for testing, focusing on their specific calibration methods.

The focus on nonautomatic-indicating scales not marked ensures that the tests are addressing those instruments where user operation could impact the weight accuracy, which is critical for ensuring compliance with standards in various applications.