What safety measures can employers use when workers are on a supported scaffold more than 10 feet above the working surface

Personal Fall Arrest System or Guardrail

Employers can make sure that the scaffold is supported by durable material. Also, they can make sure the workers are using equipment properly. They can make sure that people are monitoring the workers. Furthermore, they can make sure that there are bars around the scaffolding to keep workers from falling.

What are the choices?

Pressure and heat that's what i think( don't report if wrong)