Which of the following is the most common meter for residential or small to medium businesses?

• A. Orifice Meter
• B. Positive Displacement Meter
• C. Turbine Meter
• D. Magnetic Inductive Meter

Answer: (B)

For residential and small-to-medium business water use, meters need to give accurate readings across a wide range of everyday flow patterns, from quiet nights to brief bursts of activity. Positive displacement meters achieve this by trapping fixed volumes of water and measuring how many volumes pass through the meter. This direct volume measurement stays accurate at low and fluctuating flows, which is exactly what typical domestic and small commercial demand looks like, and they offer reliable performance with relatively simple, cost-effective installation and low pressure loss.

Other meters have trade-offs. Orifice meters rely on pressure differences and can be less accurate with variable flow and in installations that don’t maintain ideal straight piping. Turbine meters work well at higher, steady flow rates but can lose accuracy at low flows and with poor upstream conditions. Magnetic-inductive meters are accurate and durable but cost more and require proper installation and conductive water conditions. Overall, the positive displacement style remains the most common choice for homes and small businesses due to its accuracy across the typical usage range and its practicality for everyday metering.