Which piece of equipment helps ensure the accuracy of load measurements?

A load cell is the correct answer because it is a specialized device used to measure the weight or load being applied to it. Load cells convert a force into an electrical signal, allowing for precise monitoring of the weight being lifted or moved. This makes load cells essential for ensuring accuracy in load measurements, especially in crane operations and rigging, where it is crucial to know the exact weight being lifted to avoid overloading and ensure safety.

The other equipment listed—hoists, blocks, and sheaves—has different functions. A hoist is used to lift loads but does not measure their weight; it merely provides the mechanism for lifting. Blocks, typically used to redirect or support rope, also do not have measuring capabilities. Sheaves are wheels that guide cables or ropes in lifting systems but, like blocks, do not provide load measurements. Thus, a load cell is unique in its function for ensuring accuracy in load measurement among the options provided.