- NCB MRE 113 A GDS
- SIMPEDS
- Any other instrument approved by the DGMS
- All of the above
- None of these
- 120 dB (A)
- 130 dB (A)
- 140 dB (A)
- 115 dB (A)
- 90 dB (A)
- 85 dB (A)
None of these is used for measurement of respirable dust
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