The dampened deluxe quartz barograph meeasures 11" x 6 3/4" x 6 1/2" and weighs 7 lbs. The chart size is 3 5/8". The chart range is 28.5 to 31". Keep precise records of barometric pressure readings with this extraordinary German-made Dampened Deluxe Quartz Barograph. This mechanical barograph with eight round diaphragms measures variation in the air pressure and transfers the information very precisely through a system of mechanical levers to the writing arm. The battery operated quartz movement rotates the solid brass drum once a week, requires no winding and is more accurate than key-wound movements. The conventional ink nib and messy ink bottle are replaced by a convenient felt tip pen which lasts 6 to 9 months. This barograph model includes a bottle of oil damping fluid for the arm to avoid incorrect readings when on ships or yachts at sea. The elegant mahogany and glass case is polished to a high luster finish and is hinged for easy access to the movement for change of paper and pen. The chart duration is 7 days. One-year supply of weekly charts, AA battery, one felt tip pen and damping fluid are all included.