Which is the first step to take before using a direct reading instrument?

Before using a direct reading instrument, the first step should be to inspect the physical condition of the instrument. This involves checking for any visible damage, ensuring that all components are intact and functional, and verifying that the instrument is clean and ready for use. This step is crucial because using a damaged or dirty instrument can lead to inaccurate readings or even hazardous situations if the instrument fails during operation.

Inspecting the physical condition ensures that the device is in proper working order before proceeding with tasks such as calibration, battery checks, or allowing it to return to background readings, all of which should follow in the preparation process. By prioritizing the physical inspection, operators can confirm the instrument's readiness and reduce the risks associated with faulty equipment.