Abstract: A multi-function meter system for measuring multiple environmental parameters includes a hand-held meter and an environmental probe for sensing a selected environmental parameter. The meter includes a housing, an electronic assembly mounted within the housing, a display screen, an operator pad, and multiple data ports. The electronic assembly includes a microprocessor and a memory device having an operating system stored therein. The operating system either identifies the environmental parameter sensed by the environmental probe or transmits a query to the display screen requesting that the environmental parameter be identified to the operating system through the operator pad. The operating system then provides at least one measured value of the identified environmental parameter on the display screen.