Question: As a general rule, many direct-reading instruments are not designed to measure and/or detect airborne concentrations below which value? A) 1 parts per hundred B)

As a general rule, many direct-reading instruments are not designed to measure and/or detect airborne concentrations below which value? A) 1 parts per hundred B) 1 parts per thousand C) 1 parts per million D) 1 parts per billion

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