Global Decibel Meter Market By Type (Type 0 Decibel Meter, Type 1 Decibel Meter, Type 2 Decibel Meter, and Type 3 Decibel Meter), By Application (Basic Industrial, Commercial, Educational, Recreational, and Residential), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2020-2029