What is the scaler on the gauge?

• A. The digital readout
• B. The analog dial
• C. A mercury column
• D. A dial indicator

Answer: (A)

The scaler on a gauge is the part that translates the measured signal into a readable numeric value. A digital readout does this directly by displaying the exact measurement as numbers, so you get a clear, immediate value without needing to interpret a scale or dial. That direct numeric presentation is why the digital readout is the best choice.

The analog dial, while it shows the value via a needle on a scaled face, still requires interpreting where the needle points, which is less precise than a direct digital readout. A mercury column is a different type of device used for showing height or pressure of a column of liquid, not a scaler on a gauge. A dial indicator is another instrument used for precise linear measurements, not the scaler on a gauge.