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One C battery.
Use this hygrothermograph to record up to 3 months of readings. A quartz-controlled drive provides constant speed. Operates on one C battery (included) for up to six months of continuous operation. Test battery condition with the press of a button.
Chart paper advances 3'' (76.8 mm) per day; paper has two-hour increments. Unit features a corrosion-resistant plastic case with transparent cover for easy viewing.
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