Precise measurements
YOKOTA AIR BASE, Japan -- Senior Airman Paul Bishop, 374th Maintenance Squadron Precision Measurement Equipment Laboratory technician, inspects the variable range on a decade resistor box June 23, which is used to generate resistance values for calibration testing. PMEL technicians perform and manage repairs on test, measurement, and diagnostic equipment. (U.S. Air Force photo/ Staff Sgt. Veronica Pierce)