New Armaturenbau (Germany) 6 Stainless Steel Pressure Gauges 0-200 Millibars? 1/4 NPT Port, Part Number RCh 160-3, or EN 837-1. We don’t know anything about them besides what is written on the box label and the face of the gauge. According to the scale, we believe they are marked in millibars. It only takes a small amount of air pressure in PSIs to make the needle move halfway, although we did not do any extensive testing. We don’t know what the’Degrees Celsius’ marking on the lower face means, or the 0-200C (linear) on the label either. We are not experts in metric pressure measurement, so the customer can look at the pictures and decide. These are very nice gauges, and probably very expensive when ordered out of the laboratory supply catalog. According to the box label. ARMATURENBAU GmbH Manometerstrabe 5 D-46487 Wesel-Ginderich RCh 160-3 0 – 200C (linear) 1/4 NPT. According to the gauge face. EN 837-1 1.4571 0.2-1 bar (degrees) C KI. 1,0 AB (logo) 073754371.