Oakton* Three-Speed Aneroid Barograph

. Record barometric pressure for 1, 7 or 32 days
. Quartz controlled chart drive ensures constant chart rotation
Record barometric pressure from sea level to 2000 feet. Bimetal temperature compensation ensures accurate pressure readings. Uses two C batteries for up to 12 months of continuous operation. Battery condition indicator shows when to change the batteries. Housing is made of corrosion-resistant acrylic plastic. Includes pen and 1-day rotation chart.