Which instrument is described as a direct reading instrument?

Which instrument is described as a direct reading instrument?

• A. Heated Wire Anemometer: Direct Reading Instrument
• B. Local Exhaust Ventilation (LEV)
• C. Measuring Velocity
• D. Total Pressure (TP)

Answer: (A)

Direct-reading instruments provide immediate measurements in the field without needing lab analysis. A heated wire anemometer fits this because it measures air velocity and displays the reading on the device in real time, based on how the heated filament cools with airflow. Local exhaust ventilation is a ventilation system, not an instrument that gives a readout. Measuring velocity describes what you assess, not the device itself. Total pressure is a type of measurement (a parameter) that you'd obtain with instrumentation, but it’s not a device described as a direct-reading instrument. So the heated wire anemometer best fits the description.

Direct-reading instruments provide immediate measurements in the field without needing lab analysis. A heated wire anemometer fits this because it measures air velocity and displays the reading on the device in real time, based on how the heated filament cools with airflow. Local exhaust ventilation is a ventilation system, not an instrument that gives a readout. Measuring velocity describes what you assess, not the device itself. Total pressure is a type of measurement (a parameter) that you'd obtain with instrumentation, but it’s not a device described as a direct-reading instrument. So the heated wire anemometer best fits the description.