First time in a sandwich bag. No polarity markings or specifications with or on the device. I figured it out and it repeats every two seconds. I liked the potential and thought I might be wrong so I ordered another one. It was in better packaging, marked with polarity and voltage range. I used a fully charged 12v battery with a 1 amp DC device. (I measured the thrust at 1.2). When the sensor was closed it worked immediately. Disconnected, checked everything and tried to adjust the sensitivity potentiometer. Momentary testing for seconds each time and failure each time. I left it plugged in for about ten seconds
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