Which practice is recommended before weighing to ensure accuracy?

• A. Center and level the balance
• B. Weigh quickly without checks
• C. Place containers on the scale
• D. Ignore temperature fluctuations

Answer: (A)

Centering and leveling the balance is essential to get an accurate reading. When the balance is truly horizontal and the fulcrums are even, the zero point is correct and small weights translate into proportional deflection without bias. If the instrument is tilted or off-center, gravity can create a tilt bias, making the weight appear heavier or lighter than it really is. This preparation step removes that systematic error and improves precision and repeatability. The other options describe actions that either belong after zeroing (like placing a container and taring) or practices that waste accuracy (weighing hastily or ignoring temperature changes).