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I didn't know about Dwightdi's little trick but here is another almost as simple. Take about 6 feet of clear tubing and a board about 24" long. Attach the tubing to the board in a long U shape. Fill the tube half full with water and attach one end to the gas supply. Measure the difference in height, which is called water column, between the pressurized end and the open end. Should be about 11 inches. By the way what you made is called a manometer.
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Pay no attention to the man behind the curtain- WoZ
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