Wempe Barograph Chart Paper: For 52 Weeks of Accurate Recording. Keep your Wempe drum barograph always operational with this set of 52 chart sheets, available in hPa or inches. Specially designed for models CW810002, CW810003, and CW810004, this paper provides a flawless record of atmospheric changes, week after week. This paper roll will keep your barograph running smoothly for a year and ready to capture every moment of weather. An essential addition for any barograph enthusiast who doesn't want to miss a pattern or trend. Always have a set on hand to capture the fascinating movements of the atmosphere.