Bio-Tech-NPN-Non-Aggressive-Axial-Turbine-Flowmeter-Bio-Tech-Vision-2000-p-The-only-59-x-17-x-31-mm-wide-measuring-turbine-is-particularly-suitable-for-measuring-chemically-highly-aggressive-media-such-as-acids-&-lyes-in-the-chemical-industry-&-in-electroplating-for-monitoring-machine-cooling-circuits-in-the-laboratory-&-in-other-metering-technology-applications-All-parts-in-contact-with-the-medium-are-made-from-plastic-The-integral-sensor-generates-an-NPN-open-collector-signal-p