Seedburo also offers an economical mini-drum version of the hygrothermograph.  This unit offers a permanent record of temperature and relative humidity changes over a 7-day period (only). The instrument employs a quartz-controlled drive mechanism and features a protective acrylic cover that is easily removed. The mini-drum hygrothermograph will operate for approximately 6 months on one AA battery (included).  Two felt tipped pens (red and blue) are also provided.

Actual Dims. 6" L x 3⅞" W x 7⅜" H.
Ship wt: 5 lbs.