Round Barigo barograph with QUARTZ drive Accurate registration by 3 vacuum boxes in foot Drum with 7-day circulation Range 960 - 1050 millibar Battery AA type required Made in Germany ca. 1975 This Barigo is a barograph that works accurately thanks to the QUARTZ drive and the 3 membranes The drum has a rotation speed of once a week and is described by a marker mounted on a mechanism that changes height due to the changing air pressure Comes with new writing pen, battery and 110 sheet of graph paper Dimensions: Diameter 132 mm High 125 mm Weight: 750 grams Will be shipped carefully packaged.