portable,pneumatic pump,simple structure,save labour,easy to ... very difficult and hard to operate. SPMK2000H portable air pressure source is main used for calibrating at on ... -site or check no corrosive air pressure gauges . SPMK2000H portable air pressure source is made of special ... calibrator,SPMK2002-2 imported connecting hose of high air pressure,SPMK2000-1 adapter substitute of gauges,special ...