When should corrections be applied to a roller meter?

Corrections should be applied to a roller meter specifically when 2.5 pints or more of alcohol is measured. This threshold is significant because it ensures that the meter remains accurate when dealing with larger quantities of fluid. As the volume of liquid being measured increases, the potential for error in measurement due to factors such as fluid dynamics, density variations, and viscosity also increases.

In practice, roller meters are calibrated to provide accurate readings up to a certain volume, and exceeding that volume requires a recalibration or correction to maintain measurement precision. By applying corrections at the 2.5-pint level, operators can ensure that they account for these variables and maintain the integrity of their measurements.

The other options suggest lower thresholds for applying corrections, which do not account for the cumulative inaccuracies that may arise with larger volumes. Thus, only making corrections at these lower volumes could lead to inconsistencies in readings when operating the roller meter under varying amounts of alcohol.