These environmental meters measure temperature, humidity, sound and light, and air flow and wind velocity for HVAC applications. Meters have three or more functions, allowing the user to accurately and quickly measure various properties with a single meter rather than needing to devote space and extra batteries to multiple tools.

Multifunction weather meters are compact and designed for outdoor use in applications such as agriculture, jobsites, military, firefighting, or sports and leisure activities. In addition to measuring ambient temperatures and humidity, these units determine wind direction and velocity, and select models have a compass for navigation. They are durable, battery-powered units that can handle immersion in water.