Barometer Aneroid Demonstration THIS MODEL NOT WORKING With 1 0 0mm d i a l graduated 28 to 31 inch of mercury and 960 to 1060 millibars. With plated bezel, cover glass and index plastic base approx. 16cm diameter. Enclosed in a transparent synthetic case for demonstration purposes. Air tight sealed all round, a pressure bulb is provided to force the movements for educative demonstration NOT RETURN POLICY