The DSM101 features both A and C weighting making it perfect for OSHA regulatory testing, environmental testing, workplace safety design, law enforcement applications, and sound level analysis of engines and machinery. This sound meter allows the user to select fast or slow response time as needed. The DSM101 tests in either automatic ranging for unknown sound levels or manual ranging to provide faster readings. This meter features 4 measurement ranges and mounts to a camera tripod for increased stability, improved accuracy, and to help eliminate hand sound reflection from the user. Three year limited warranty.