Global Heat Index Meter Market By Type (Heat Index Anemometer, Heat Stress WBGT Meter, HeatWatch Humidity/Temperature Stopwatch, Heat Index Psychrometer, Handheld Heat Stress Index, and Digital Heat Index Meter), By Application (Air Velocity, Weather Conditions, Outdoor Activities, and Indoor Workplace), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2020-2029