What device is specifically made for sagging wire and is similar to a stop watch?

• A. Stop watch
• B. Unisag watch
• C. Dynamometer
• D. Sag scope

Answer: (B)

Measuring how far a conductor sags under load requires a tool built for that purpose, not just a general timing device. The Unisag watch is a specialized instrument designed to measure conductor sag by providing timing or readings tied to sag standards, so you get a quick, repeatable measurement that can be compared to acceptable tolerances. It functions like a stopwatch but with sag-specific calibration, which makes it much better suited for ensuring the wire has the correct clearance and tension than a plain timer. A regular stop watch only records time, not sag data; a dynamometer measures tension, not the vertical drop; and a sag scope would give a visual or different kind of reading that isn’t the standard tool used for sag checks in this context.