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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 3 7/8" W x 7 3/8" H. Ship wt 5 lbs.

Mini-drum Hygrothermograph ............................................. No. 8369
Replacement Pens, Blue (pkg of 6) ..................................... No. 3725PB
Replacement Pens, Red (pkg of 6) ...................................... No. 3725PR

Hygrothermograph Charts (pkg of 100):

7-Day, 22 to 104°F ............................................................ No. 8369F
7-Day, -6 to 40°C ............................................................. No. 8369C