In what situation is a "turnbuckle" typically used?

A turnbuckle is primarily utilized to adjust the tension in rigging lines. It consists of a metal frame with two threaded eye bolts that can be screwed in or out, allowing for precise adjustments to the tension of the lines connected to it. When properly tightened or loosened, a turnbuckle can effectively change the length of the rigging, which is crucial in applications requiring specific tension to ensure safety and accuracy, such as in lifting operations or tensioning guy wires in construction.

In contrast, securing loads during transport typically involves mechanisms such as straps, chains, or wraps, which are designed to hold items in place rather than adjust tension. Connecting two rigging lines together might be accomplished through other means, such as connectors or knots, but a turnbuckle serves a different purpose. Finally, measuring the weight of a load is performed with scales or load cells, not with a turnbuckle, which is not designed for measurement but rather for tension adjustment. Therefore, the use of a turnbuckle is best associated with adjusting tension in rigging lines.