center zero

center zero ammeter

center zero relay

center zero scale

center-zero gauge

large scientific instrument center

Mass center instrument

Meteorological Instrument Center of Jiangxi Province

Meteorological Technology Instrument Center of Jiangxi Province

Metrological Instrument center of Chong－ qing city

National Large-scale Scientific Instrument Center

off-center instrument

zero center

zero center meter

zero center scale

zero-center scale

centre zero instrument

centre-zero instrument

instrument zero