Q:  Just what the heck is this PMEL and metrology stuff??

A:  Well...   Metrology is defined as the science of weights  & measures, while a PMEL is the place where technicians perform all of the metrology for the U.S. Air Force.  Airmen in this career field are primarily responsible for the repair, calibration, and modification of test, measurement, and diagnostic equipment (TMDE), including precision measurement equipment laboratory standards and automatic test equipment. They also supervise the process and use of TMDE to perform voltage, current, power, impedance, frequency, microwave, temperature, physical-dimensional, and optical measurements.  They perform these functions in a strictly controlled laboratory environment where the temperature and humidity are constantly monitored.