EM54 is an environmental meter for HVAC/R measurements. Based on hygrometer technology, identifies deviations from ambient relative humidity levels, which can cause static hazards at manufacturing sites and discomfort in homes and offices. Helps users identify symptoms of clogged HVAC/R filters, duct leaks that reduce airflow and overloaded systems. Ideal for inspecting ducting, electrical motors, thermal equipment, and other system components in residential, commercial, and industrial facilities