When making voltage measurements, you should ___.

Setting the meter on a surface when making voltage measurements is the safest and most effective practice. Doing so minimizes the likelihood of accidental movement, which could lead to incorrect measurements or pose safety risks. A stable surface provides a secure base for the meter, ensuring that it remains in position during the measurement process.

Holding the meter in hand could introduce variables such as movement or interference from the operator’s body, which can affect accuracy. Moreover, performing measurements while on a surface helps maintain focus on the readings without the distraction of holding the instrument. The other options have inherent risks and safety concerns, particularly measuring without safety precautions or in wet conditions, which can significantly increase the chance of electrical shock or equipment damage. Thus, placing the meter on a stable surface is the most reliable approach for accurate and safe voltage measurements.