Oakton Long-Cycle Hygrothermograph, battery operated, up to 3 months per chart

One C battery.

主要特点

Long-Cycle Hygrothermograph
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.