Russell Scientific Marine Barograph Marine barograph with vibration-damped measuring system and quartz-powered seven day clock. Supplied in a glazed, mahogany-stained, hinged beech wood case with storage draw for spare charts & Nibs. Measuring range: 955 to 1060 millibars, with an accuracy of +/- 0.7 millibars. Packed weight is approximately 5kgs. Instrument only approximately 4.5kgs. 345mm (13 1/2”) x 190mm (7 1/2”) x 185mm (7 1/4”)